diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 13ef95c7..293c4cd0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -187,8 +187,6 @@ jobs:
         export USE_WAE=ON
         export CMAKE_EXTRA_ARGS=()
         if [ '${{ matrix.config.compiler }}' == 'msvc' ]; then
-          # 1. Go to hell
-          export USE_WAE=OFF
           CMAKE_EXTRA_ARGS+=('-DCMAKE_GENERATOR_PLATFORM=${{ steps.windows-identify.outputs.msvc-target }}')
 
           # Force static linking
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6b807dd..2e9e9c6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,13 @@ option(SYSTEM_SDL2 "Use a system-installed version of SDL2 instead of the vendor
 option(WARNINGS_ARE_ERRORS "Whether warnings in furnace's C++ code should be treated as errors" OFF)
 
 set(DEPENDENCIES_INCLUDE_DIRS "")
+
+if (ANDROID)
+set(DEPENDENCIES_DEFINES "IS_MOBILE")
+else()
 set(DEPENDENCIES_DEFINES "")
+endif()
+
 set(DEPENDENCIES_COMPILE_OPTIONS "")
 set(DEPENDENCIES_LIBRARIES "")
 set(DEPENDENCIES_LIBRARY_DIRS "")
@@ -310,6 +316,8 @@ src/engine/platform/sound/vic20sound.c
 
 src/engine/platform/sound/vrcvi/vrcvi.cpp
 
+src/engine/platform/sound/scc/scc.cpp
+
 src/engine/platform/ym2610Interface.cpp
 
 src/engine/blip_buf.c
@@ -343,6 +351,7 @@ src/engine/platform/nes.cpp
 src/engine/platform/c64.cpp
 src/engine/platform/arcade.cpp
 src/engine/platform/tx81z.cpp
+src/engine/platform/ym2203.cpp
 src/engine/platform/ym2610.cpp
 src/engine/platform/ym2610ext.cpp
 src/engine/platform/ym2610b.cpp
@@ -367,6 +376,7 @@ src/engine/platform/n163.cpp
 src/engine/platform/pet.cpp
 src/engine/platform/vic20.cpp
 src/engine/platform/vrc6.cpp
+src/engine/platform/scc.cpp
 src/engine/platform/dummy.cpp
 )
 
diff --git a/README.md b/README.md
index 1eac106d..caa4714c 100644
--- a/README.md
+++ b/README.md
@@ -126,7 +126,7 @@ Available options:
 
 | Name | Default | Description |
 | :--: | :-----: | ----------- |
-| `BUILD_GUI` | `ON` if not building for Android, otherwise `OFF` | Build the tracker (disable to build only a headless player) |
+| `BUILD_GUI` | `ON` | Build the tracker (disable to build only a headless player) |
 | `WITH_JACK` | `ON` if system-installed JACK detected, otherwise `OFF` | Whether to build with JACK support. Auto-detects if JACK is available |
 | `SYSTEM_FMT` | `OFF` | Use a system-installed version of fmt instead of the vendored one |
 | `SYSTEM_LIBSNDFILE` | `OFF` | Use a system-installed version of libsndfile instead of the vendored one |
diff --git a/TODO.md b/TODO.md
index c11d4755..fc526b29 100644
--- a/TODO.md
+++ b/TODO.md
@@ -9,7 +9,6 @@
 - OPNA system
 - ZX beeper system
 - Y8950 system
-- SCC/SCC+ system
 - maybe YMU759 ADPCM channel
 - ADPCM chips
 - Game Boy envelope macro/sequence
diff --git a/papers/format.md b/papers/format.md
index 7ab67800..e6d35e83 100644
--- a/papers/format.md
+++ b/papers/format.md
@@ -232,6 +232,9 @@ size | description
   4f | A-4 tuning
   1  | limit slides (>=36) or reserved
   1  | linear pitch (>=36) or reserved
+     | - 0: non-linaer
+     | - 1: only pitch change (04xy/E5xx) linear
+     | - 2: full linear (>=94)
   1  | loop modality (>=36) or reserved
   1  | proper noise layout (>=42) or reserved
   1  | wave duty is volume (>=42) or reserved
@@ -286,7 +289,8 @@ size | description
   1  | weird f-num/block-based chip pitch slides (>=85) or reserved
   1  | SN duty macro always resets phase (>=86) or reserved
   1  | pitch macro is linear (>=90) or reserved
- 19  | reserved
+  1  | pitch slide speed in full linear pitch mode (>=94) or reserved
+ 18  | reserved
 ```
 
 # instrument
diff --git a/src/engine/dispatchContainer.cpp b/src/engine/dispatchContainer.cpp
index f44ed0d5..7595d14b 100644
--- a/src/engine/dispatchContainer.cpp
+++ b/src/engine/dispatchContainer.cpp
@@ -29,6 +29,7 @@
 #include "platform/c64.h"
 #include "platform/arcade.h"
 #include "platform/tx81z.h"
+#include "platform/ym2203.h"
 #include "platform/ym2610.h"
 #include "platform/ym2610ext.h"
 #include "platform/ym2610b.h"
@@ -54,6 +55,7 @@
 #include "platform/vrc6.h"
 #include "platform/fds.h"
 #include "platform/mmc5.h"
+#include "platform/scc.h"
 #include "platform/dummy.h"
 #include "../ta-log.h"
 #include "song.h"
@@ -233,6 +235,9 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
     case DIV_SYSTEM_TIA:
       dispatch=new DivPlatformTIA;
       break;
+    case DIV_SYSTEM_OPN:
+      dispatch=new DivPlatformYM2203;
+      break;
     case DIV_SYSTEM_OPLL:
     case DIV_SYSTEM_OPLL_DRUMS:
     case DIV_SYSTEM_VRC7:
@@ -314,6 +319,14 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
     case DIV_SYSTEM_MMC5:
       dispatch=new DivPlatformMMC5;
       break;
+    case DIV_SYSTEM_SCC:
+      dispatch=new DivPlatformSCC;
+      ((DivPlatformSCC*)dispatch)->setChipModel(false);
+      break;
+    case DIV_SYSTEM_SCC_PLUS:
+      dispatch=new DivPlatformSCC;
+      ((DivPlatformSCC*)dispatch)->setChipModel(true);
+      break;
     case DIV_SYSTEM_SOUND_UNIT:
       dispatch=new DivPlatformSoundUnit;
       break;
diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index e9bd3f10..63949bfc 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -986,38 +986,66 @@ int DivEngine::calcBaseFreq(double clock, double divider, int note, bool period)
 }*/
 
 double DivEngine::calcBaseFreq(double clock, double divider, int note, bool period) {
+  if (song.linearPitch==2) { // full linear
+    return (note<<7);
+  }
   double base=(period?(song.tuning*0.0625):song.tuning)*pow(2.0,(float)(note+3)/12.0);
   return period?
          (clock/base)/divider:
          base*(divider/clock);
 }
 
-unsigned short DivEngine::calcBaseFreqFNumBlock(double clock, double divider, int note, int bits) {
-  int bf=calcBaseFreq(clock,divider,note,false);
-  int block=note/12;
-  if (block<0) block=0;
-  if (block>7) block=7;
-  bf>>=block;
-  if (bf<0) bf=0;
-  // octave boundaries
-  while (bf>0 && bf<644 && block>0) {
-    bf<<=1;
-    block--;
-  }
-  if (bf>1288) {
-    while (block<7) {
-      bf>>=1;
-      block++;
-    }
-    if (bf>((1<<bits)-1)) {
-      bf=(1<<bits)-1;
-    }
-  }
+#define CONVERT_FNUM_BLOCK(bf,bits,note) \
+  double tuning=song.tuning; \
+  if (tuning<400.0) tuning=400.0; \
+  if (tuning>500.0) tuning=500.0; \
+  int boundaryBottom=tuning*pow(2.0,0.25)*(divider/clock); \
+  int boundaryTop=2.0*tuning*pow(2.0,0.25)*(divider/clock); \
+  int block=(note)/12; \
+  if (block<0) block=0; \
+  if (block>7) block=7; \
+  bf>>=block; \
+  if (bf<0) bf=0; \
+  /* octave boundaries */ \
+  while (bf>0 && bf<boundaryBottom && block>0) { \
+    bf<<=1; \
+    block--; \
+  } \
+  if (bf>boundaryTop) { \
+    while (block<7 && bf>boundaryTop) { \
+      bf>>=1; \
+      block++; \
+    } \
+    if (bf>((1<<bits)-1)) { \
+      bf=(1<<bits)-1; \
+    } \
+  } \
+  /* logV("f-num: %d block: %d",bf,block); */ \
   return bf|(block<<bits);
+
+int DivEngine::calcBaseFreqFNumBlock(double clock, double divider, int note, int bits) {
+  if (song.linearPitch==2) { // full linear
+    return (note<<7);
+  }
+  int bf=calcBaseFreq(clock,divider,note,false);
+  CONVERT_FNUM_BLOCK(bf,bits,note)
 }
 
-int DivEngine::calcFreq(int base, int pitch, bool period, int octave, int pitch2) {
-  if (song.linearPitch) {
+int DivEngine::calcFreq(int base, int pitch, bool period, int octave, int pitch2, double clock, double divider, int blockBits) {
+  if (song.linearPitch==2) {
+    // do frequency calculation here
+    int nbase=base+pitch+pitch2;
+    double fbase=(period?(song.tuning*0.0625):song.tuning)*pow(2.0,(float)(nbase+384)/(128.0*12.0));
+    int bf=period?
+           round((clock/fbase)/divider):
+           round(fbase*(divider/clock));
+    if (blockBits>0) {
+      CONVERT_FNUM_BLOCK(bf,blockBits,nbase>>7)
+    } else {
+      return bf;
+    }
+  }
+  if (song.linearPitch==1) {
     // global pitch multiplier
     int whatTheFuck=(1024+(globalPitch<<6)-(globalPitch<0?globalPitch-6:0));
     if (whatTheFuck<1) whatTheFuck=1; // avoids division by zero but please kill me
@@ -1209,7 +1237,7 @@ void DivEngine::reset() {
     chan[i]=DivChannelState();
     if (i<chans) chan[i].volMax=(disCont[dispatchOfChan[i]].dispatch->dispatch(DivCommand(DIV_CMD_GET_VOLMAX,dispatchChanOfChan[i]))<<8)|0xff;
     chan[i].volume=chan[i].volMax;
-    if (!song.linearPitch) chan[i].vibratoFine=4;
+    if (song.linearPitch==0) chan[i].vibratoFine=4;
   }
   extValue=0;
   extValuePresent=0;
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 728927ae..4a3d8b6a 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -45,8 +45,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev93"
-#define DIV_ENGINE_VERSION 93
+#define DIV_VERSION "dev94"
+#define DIV_ENGINE_VERSION 94
 
 // for imports
 #define DIV_VERSION_MOD 0xff01
@@ -484,10 +484,10 @@ class DivEngine {
     double calcBaseFreq(double clock, double divider, int note, bool period);
 
     // calculate base frequency in f-num/block format
-    unsigned short calcBaseFreqFNumBlock(double clock, double divider, int note, int bits);
+    int calcBaseFreqFNumBlock(double clock, double divider, int note, int bits);
 
     // calculate frequency/period
-    int calcFreq(int base, int pitch, bool period=false, int octave=0, int pitch2=0);
+    int calcFreq(int base, int pitch, bool period=false, int octave=0, int pitch2=0, double clock=1.0, double divider=1.0, int blockBits=0);
 
     // convert panning formats
     int convertPanSplitToLinear(unsigned int val, unsigned char bits, int range);
diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 8c93ef5b..e0f20794 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -139,7 +139,7 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
 
     // compatibility flags
     ds.limitSlides=true;
-    ds.linearPitch=true;
+    ds.linearPitch=1;
     ds.loopModality=0;
     ds.properNoiseLayout=false;
     ds.waveDutyIsVol=false;
@@ -173,12 +173,14 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
       ds.legacyVolumeSlides=false;
     }
 
-    // Neo Geo detune
+    // Neo Geo detune is caused by Defle running Neo Geo at the wrong clock.
+    /*
     if (ds.system[0]==DIV_SYSTEM_YM2610 || ds.system[0]==DIV_SYSTEM_YM2610_EXT
      || ds.system[0]==DIV_SYSTEM_YM2610_FULL || ds.system[0]==DIV_SYSTEM_YM2610_FULL_EXT
      || ds.system[0]==DIV_SYSTEM_YM2610B || ds.system[0]==DIV_SYSTEM_YM2610B_EXT) {
       ds.tuning=443.23;
     }
+    */
 
     logI("reading module data...");
     if (ds.version>0x0c) {
@@ -948,7 +950,7 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
 
     if (ds.version<37) { // compat flags not stored back then
       ds.limitSlides=true;
-      ds.linearPitch=true;
+      ds.linearPitch=1;
       ds.loopModality=0;
     }
     if (ds.version<43) {
@@ -1390,7 +1392,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<19; i++) {
+      if (ds.version>=94) {
+        ds.pitchSlideSpeed=reader.readC();
+      } else {
+        reader.readC();
+      }
+      for (int i=0; i<18; i++) {
         reader.readC();
       }
     }
@@ -1647,7 +1654,7 @@ bool DivEngine::loadMod(unsigned char* file, size_t len) {
     DivSong ds;
     ds.tuning=436.0;
     ds.version=DIV_VERSION_MOD;
-    ds.linearPitch=false;
+    ds.linearPitch=0;
     ds.noSlidesOnFirstTick=true;
     ds.rowResetsArpPos=true;
     ds.ignoreJumpAtEnd=false;
@@ -2700,7 +2707,8 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   w->writeC(song.fbPortaPause);
   w->writeC(song.snDutyReset);
   w->writeC(song.pitchMacroIsLinear);
-  for (int i=0; i<19; i++) {
+  w->writeC(song.pitchSlideSpeed);
+  for (int i=0; i<18; i++) {
     w->writeC(0);
   }
 
diff --git a/src/engine/platform/amiga.cpp b/src/engine/platform/amiga.cpp
index e78c3a77..df742d35 100644
--- a/src/engine/platform/amiga.cpp
+++ b/src/engine/platform/amiga.cpp
@@ -220,7 +220,7 @@ void DivPlatformAmiga::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_AMIGA);
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].freq>4095) chan[i].freq=4095;
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/ay.cpp b/src/engine/platform/ay.cpp
index 37108452..dbc5aa82 100644
--- a/src/engine/platform/ay.cpp
+++ b/src/engine/platform/ay.cpp
@@ -251,7 +251,7 @@ void DivPlatformAY8910::tick(bool sysTick) {
       if (!chan[i].std.ex3.will) chan[i].autoEnvNum=1;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].freq>4095) chan[i].freq=4095;
       if (chan[i].keyOn) {
         //rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
diff --git a/src/engine/platform/ay8930.cpp b/src/engine/platform/ay8930.cpp
index 3fec732b..6fb34096 100644
--- a/src/engine/platform/ay8930.cpp
+++ b/src/engine/platform/ay8930.cpp
@@ -280,7 +280,7 @@ void DivPlatformAY8930::tick(bool sysTick) {
       immWrite(0x1a,ayNoiseOr);
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].freq>65535) chan[i].freq=65535;
       if (chan[i].keyOn) {
         if (chan[i].insChanged) {
diff --git a/src/engine/platform/bubsyswsg.cpp b/src/engine/platform/bubsyswsg.cpp
index b12a92ed..52fb4a50 100644
--- a/src/engine/platform/bubsyswsg.cpp
+++ b/src/engine/platform/bubsyswsg.cpp
@@ -137,7 +137,7 @@ void DivPlatformBubSysWSG::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_SCC);
-      chan[i].freq=0x1000-parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true)+chan[i].pitch2;
+      chan[i].freq=0x1000-parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>4095) chan[i].freq=4095;
       k005289->load(i,chan[i].freq);
diff --git a/src/engine/platform/c64.cpp b/src/engine/platform/c64.cpp
index c0efdd6f..17b8124d 100644
--- a/src/engine/platform/c64.cpp
+++ b/src/engine/platform/c64.cpp
@@ -217,7 +217,7 @@ void DivPlatformC64::tick(bool sysTick) {
     }
 
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].freq>0xffff) chan[i].freq=0xffff;
       if (chan[i].keyOn) {
         rWrite(i*7+5,(chan[i].attack<<4)|(chan[i].decay));
diff --git a/src/engine/platform/dummy.cpp b/src/engine/platform/dummy.cpp
index 34d614eb..48c33f05 100644
--- a/src/engine/platform/dummy.cpp
+++ b/src/engine/platform/dummy.cpp
@@ -61,7 +61,7 @@ void DivPlatformDummy::tick(bool sysTick) {
 
     if (chan[i].freqChanged) {
       chan[i].freqChanged=false;
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,0,0,chipClock,CHIP_FREQBASE);
     }
   }
 }
diff --git a/src/engine/platform/fds.cpp b/src/engine/platform/fds.cpp
index f3908148..5698f004 100644
--- a/src/engine/platform/fds.cpp
+++ b/src/engine/platform/fds.cpp
@@ -220,7 +220,7 @@ void DivPlatformFDS::tick(bool sysTick) {
       }
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].freq>4095) chan[i].freq=4095;
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/gb.cpp b/src/engine/platform/gb.cpp
index 1fc2b278..963d2fde 100644
--- a/src/engine/platform/gb.cpp
+++ b/src/engine/platform/gb.cpp
@@ -237,7 +237,7 @@ void DivPlatformGB::tick(bool sysTick) {
         if (ntPos>255) ntPos=255;
         chan[i].freq=noiseTable[ntPos];
       } else {
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
         if (chan[i].freq>2047) chan[i].freq=2047;
         if (chan[i].freq<0) chan[i].freq=0;
       }
diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 0f665cba..b35d09ee 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -471,17 +471,21 @@ void DivPlatformGenesis::tick(bool sysTick) {
   for (int i=0; i<6; i++) {
     if (i==2 && extMode) continue;
     if (chan[i].freqChanged) {
-      int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2);
-      int block=(chan[i].baseFreq&0xf800)>>11;
-      if (fNum<0) fNum=0;
-      if (fNum>2047) {
-        while (block<7) {
-          fNum>>=1;
-          block++;
+      if (parent->song.linearPitch==2) {
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+        int block=(chan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
         }
-        if (fNum>2047) fNum=2047;
+        chan[i].freq=(block<<11)|fNum;
       }
-      chan[i].freq=(block<<11)|fNum;
       if (chan[i].freq>0x3fff) chan[i].freq=0x3fff;
       immWrite(chanOffs[i]+ADDR_FREQH,chan[i].freq>>8);
       immWrite(chanOffs[i]+ADDR_FREQ,chan[i].freq&0xff);
@@ -495,7 +499,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
             off=(double)s->centerRate/8363.0;
           }
         }
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4)+chan[i].pitch2;
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,1,1);
         dacRate=chan[i].freq*off;
         if (dacRate<1) dacRate=1;
         if (dumpWrites) addWrite(0xffff0001,dacRate);
@@ -702,6 +706,29 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
+      if (parent->song.linearPitch==2) {
+        int destFreq=NOTE_FREQUENCY(c.value2);
+        bool return2=false;
+        if (destFreq>chan[c.chan].baseFreq) {
+          chan[c.chan].baseFreq+=c.value;
+          if (chan[c.chan].baseFreq>=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          chan[c.chan].baseFreq-=c.value;
+          if (chan[c.chan].baseFreq<=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        chan[c.chan].freqChanged=true;
+        if (return2) {
+          chan[c.chan].inPorta=false;
+          return 2;
+        }
+        break;
+      }
       if (c.chan==5 && chan[c.chan].furnaceDac && dacMode) {
         int destFreq=parent->calcBaseFreq(1,1,c.value2,false);
         bool return2=false;
@@ -725,6 +752,8 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
         }
         break;
       }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
       int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
@@ -747,13 +776,13 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
       // check for octave boundary
       // what the heck!
       if (!chan[c.chan].portaPause) {
-        if ((newFreq&0x7ff)>1288 && (newFreq&0xf800)<0x3800) {
-          chan[c.chan].portaPauseFreq=(644)|((newFreq+0x800)&0xf800);
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
           chan[c.chan].portaPause=true;
           break;
         }
-        if ((newFreq&0x7ff)<644 && (newFreq&0xf800)>0) {
-          chan[c.chan].portaPauseFreq=newFreq=(1287)|((newFreq-0x800)&0xf800);
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
           chan[c.chan].portaPause=true;
           break;
         }
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index ae4d74cd..f0c35ecc 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -127,6 +127,31 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
+      if (parent->song.linearPitch==2) {
+        int destFreq=NOTE_FREQUENCY(c.value2);
+        bool return2=false;
+        if (destFreq>opChan[ch].baseFreq) {
+          opChan[ch].baseFreq+=c.value;
+          if (opChan[ch].baseFreq>=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          opChan[ch].baseFreq-=c.value;
+          if (opChan[ch].baseFreq<=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        opChan[ch].freqChanged=true;
+        if (return2) {
+          //opChan[ch].inPorta=false;
+          return 2;
+        }
+        break;
+      }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
       int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
@@ -148,18 +173,18 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
       }
       // what the heck!
       if (!opChan[ch].portaPause) {
-        if ((newFreq&0x7ff)>1288 && (newFreq&0xf800)<0x3800) {
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
           if (parent->song.fbPortaPause) {
-            opChan[ch].portaPauseFreq=(644)|((newFreq+0x800)&0xf800);
+            opChan[ch].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
             opChan[ch].portaPause=true;
             break;
           } else {
             newFreq=(newFreq>>1)|((newFreq+0x800)&0xf800);
           }
         }
-        if ((newFreq&0x7ff)<644 && (newFreq&0xf800)>0) {
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
           if (parent->song.fbPortaPause) {
-            opChan[ch].portaPauseFreq=newFreq=(1287)|((newFreq-0x800)&0xf800);
+            opChan[ch].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
             opChan[ch].portaPause=true;
             break;
           } else {
@@ -435,17 +460,21 @@ void DivPlatformGenesisExt::tick(bool sysTick) {
   unsigned char writeMask=2;
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
-      int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,4,opChan[i].pitch2);
-      int block=(opChan[i].baseFreq&0xf800)>>11;
-      if (fNum<0) fNum=0;
-      if (fNum>2047) {
-        while (block<7) {
-          fNum>>=1;
-          block++;
+      if (parent->song.linearPitch==2) {
+        opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,4,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,4,opChan[i].pitch2);
+        int block=(opChan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
         }
-        if (fNum>2047) fNum=2047;
+        opChan[i].freq=(block<<11)|fNum;
       }
-      opChan[i].freq=(block<<11)|fNum;
       if (opChan[i].freq>0x3fff) opChan[i].freq=0x3fff;
       immWrite(opChanOffsH[i],opChan[i].freq>>8);
       immWrite(opChanOffsL[i],opChan[i].freq&0xff);
diff --git a/src/engine/platform/lynx.cpp b/src/engine/platform/lynx.cpp
index 09571061..dd5a2be0 100644
--- a/src/engine/platform/lynx.cpp
+++ b/src/engine/platform/lynx.cpp
@@ -201,7 +201,7 @@ void DivPlatformLynx::tick(bool sysTick) {
         WRITE_OTHER(i, ((chan[i].lfsr&0xf00)>>4));
         chan[i].lfsr=-1;
       }
-      chan[i].fd=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].fd=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].std.duty.had) {
         chan[i].duty=chan[i].std.duty.val;
         WRITE_FEEDBACK(i, chan[i].duty.feedback);
diff --git a/src/engine/platform/mmc5.cpp b/src/engine/platform/mmc5.cpp
index 8446643b..9775e639 100644
--- a/src/engine/platform/mmc5.cpp
+++ b/src/engine/platform/mmc5.cpp
@@ -146,7 +146,7 @@ void DivPlatformMMC5::tick(bool sysTick) {
       }
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2)-1;
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER)-1;
       if (chan[i].freq>2047) chan[i].freq=2047;
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/n163.cpp b/src/engine/platform/n163.cpp
index ef368203..9318b4f8 100644
--- a/src/engine/platform/n163.cpp
+++ b/src/engine/platform/n163.cpp
@@ -357,7 +357,7 @@ void DivPlatformN163::tick(bool sysTick) {
       chan[i].waveUpdated=false;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq((((chan[i].baseFreq*chan[i].waveLen)*(chanMax+1))/16),chan[i].pitch,false,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq((((chan[i].baseFreq*chan[i].waveLen)*(chanMax+1))/16),chan[i].pitch,false,0,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>0x3ffff) chan[i].freq=0x3ffff;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/nes.cpp b/src/engine/platform/nes.cpp
index 4b301839..ef3b51f0 100644
--- a/src/engine/platform/nes.cpp
+++ b/src/engine/platform/nes.cpp
@@ -308,7 +308,7 @@ void DivPlatformNES::tick(bool sysTick) {
         if (ntPos>252) ntPos=252;
         chan[i].freq=(parent->song.properNoiseLayout)?(15-(chan[i].baseFreq&15)):(noiseTable[ntPos]);
       } else {
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2)-1;
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER)-1;
         if (chan[i].freq>2047) chan[i].freq=2047;
         if (chan[i].freq<0) chan[i].freq=0;
       }
diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index ff31ad40..0933934c 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -511,7 +511,7 @@ void DivPlatformOPL::tick(bool sysTick) {
   bool updateDrums=false;
   for (int i=0; i<totalChans; i++) {
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].freq>131071) chan[i].freq=131071;
       int freqt=toFreq(chan[i].freq)+chan[i].pitch2;
       chan[i].freqH=freqt>>8;
@@ -800,19 +800,19 @@ int DivPlatformOPL::dispatch(DivCommand c) {
       int newFreq;
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq+c.value*((parent->song.linearPitch==2)?1:octave(chan[c.chan].baseFreq));
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq-c.value*((parent->song.linearPitch==2)?1:octave(chan[c.chan].baseFreq));
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       }
-      if (!chan[c.chan].portaPause) {
+      if (!chan[c.chan].portaPause && parent->song.linearPitch!=2) {
         if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
           chan[c.chan].portaPause=true;
           break;
diff --git a/src/engine/platform/opll.cpp b/src/engine/platform/opll.cpp
index b4f0916a..50eab344 100644
--- a/src/engine/platform/opll.cpp
+++ b/src/engine/platform/opll.cpp
@@ -300,7 +300,7 @@ void DivPlatformOPLL::tick(bool sysTick) {
 
   for (int i=0; i<11; i++) {
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].freq>262143) chan[i].freq=262143;
       int freqt=toFreq(chan[i].freq)+chan[i].pitch2;
       chan[i].freqL=freqt&0xff;
@@ -578,13 +578,13 @@ int DivPlatformOPLL::dispatch(DivCommand c) {
       int newFreq;
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq+c.value*((parent->song.linearPitch==2)?1:octave(chan[c.chan].baseFreq));
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq-c.value*((parent->song.linearPitch==2)?1:octave(chan[c.chan].baseFreq));
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
diff --git a/src/engine/platform/pce.cpp b/src/engine/platform/pce.cpp
index c28b81db..9838f987 100644
--- a/src/engine/platform/pce.cpp
+++ b/src/engine/platform/pce.cpp
@@ -227,7 +227,7 @@ void DivPlatformPCE::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_PCE);
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].furnaceDac) {
         double off=1.0;
         if (chan[i].dacSample>=0 && chan[i].dacSample<parent->song.sampleLen) {
diff --git a/src/engine/platform/pcspkr.cpp b/src/engine/platform/pcspkr.cpp
index 434ab10b..8ecf6dae 100644
--- a/src/engine/platform/pcspkr.cpp
+++ b/src/engine/platform/pcspkr.cpp
@@ -223,7 +223,7 @@ void DivPlatformPCSpeaker::tick(bool sysTick) {
       chan[i].freqChanged=true;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2)-1;
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER)-1;
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>65535) chan[i].freq=65535;
       if (chan[i].keyOn) {
diff --git a/src/engine/platform/pet.cpp b/src/engine/platform/pet.cpp
index 8ddee9e8..f2ee6add 100644
--- a/src/engine/platform/pet.cpp
+++ b/src/engine/platform/pet.cpp
@@ -118,7 +118,7 @@ void DivPlatformPET::tick(bool sysTick) {
       chan.freqChanged=true;
     }
   if (chan.freqChanged || chan.keyOn || chan.keyOff) {
-    chan.freq=parent->calcFreq(chan.baseFreq,chan.pitch,true,0,chan.pitch2);
+    chan.freq=parent->calcFreq(chan.baseFreq,chan.pitch,true,0,chan.pitch2,chipClock,CHIP_DIVIDER);
     if (chan.freq>257) chan.freq=257;
     if (chan.freq<2) chan.freq=2;
     rWrite(8,chan.freq-2);
diff --git a/src/engine/platform/qsound.cpp b/src/engine/platform/qsound.cpp
index 6e89e5b6..e9b4e8a4 100644
--- a/src/engine/platform/qsound.cpp
+++ b/src/engine/platform/qsound.cpp
@@ -24,7 +24,7 @@
 #include <map>
 
 #define CHIP_DIVIDER (1248*2)
-#define QS_NOTE_FREQUENCY(x) parent->calcBaseFreq(440,0x1000,(x)-3,false)
+#define QS_NOTE_FREQUENCY(x) parent->calcBaseFreq(440,4096,(x)-3,false)
 
 #define rWrite(a,v) {if(!skipRegisterWrites) {qsound_write_data(&chip,a,v); if(dumpWrites) addWrite(a,v); }}
 #define immWrite(a,v) {qsound_write_data(&chip,a,v); if(dumpWrites) addWrite(a,v);}
@@ -296,14 +296,8 @@ void DivPlatformQSound::tick(bool sysTick) {
     uint16_t qsound_addr = 0;
     uint16_t qsound_loop = 0;
     uint16_t qsound_end = 0;
-    double off=1.0;
     if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
       DivSample* s=parent->getSample(chan[i].sample);
-      if (s->centerRate<1) {
-        off=1.0;
-      } else {
-        off=(double)s->centerRate/24038.0/16.0;
-      }
       qsound_bank = 0x8000 | (s->offQSound >> 16);
       qsound_addr = s->offQSound & 0xffff;
 
@@ -322,15 +316,15 @@ void DivPlatformQSound::tick(bool sysTick) {
     if (chan[i].std.arp.had) {
       if (!chan[i].inPorta) {
         if (chan[i].std.arp.mode) {
-          chan[i].baseFreq=off*QS_NOTE_FREQUENCY(chan[i].std.arp.val);
+          chan[i].baseFreq=QS_NOTE_FREQUENCY(chan[i].std.arp.val);
         } else {
-          chan[i].baseFreq=off*QS_NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
+          chan[i].baseFreq=QS_NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
         }
       }
       chan[i].freqChanged=true;
     } else {
       if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
-        chan[i].baseFreq=off*QS_NOTE_FREQUENCY(chan[i].note);
+        chan[i].baseFreq=QS_NOTE_FREQUENCY(chan[i].note);
         chan[i].freqChanged=true;
       }
     }
@@ -354,7 +348,16 @@ void DivPlatformQSound::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_AMIGA);
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2);
+      double off=1.0;
+      if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
+        DivSample* s=parent->getSample(chan[i].sample);
+        if (s->centerRate<1) {
+          off=1.0;
+        } else {
+          off=(double)s->centerRate/24038.0/16.0;
+        }
+      }
+      chan[i].freq=off*parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,440.0,4096.0);
       if (chan[i].freq>0xffff) chan[i].freq=0xffff;
       if (chan[i].keyOn) {
         rWrite(q1_reg_map[Q1V_BANK][i], qsound_bank);
@@ -388,17 +391,8 @@ int DivPlatformQSound::dispatch(DivCommand c) {
     case DIV_CMD_NOTE_ON: {
       DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA);
       chan[c.chan].sample=ins->amiga.initSample;
-      double off=1.0;
-      if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
-        DivSample* s=parent->getSample(chan[c.chan].sample);
-        if (s->centerRate<1) {
-          off=1.0;
-        } else {
-          off=(double)s->centerRate/24038.0/16.0;
-        }
-      }
       if (c.value!=DIV_NOTE_NULL) {
-        chan[c.chan].baseFreq=off*QS_NOTE_FREQUENCY(c.value);
+        chan[c.chan].baseFreq=QS_NOTE_FREQUENCY(c.value);
       }
       if (chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
         chan[c.chan].sample=-1;
@@ -467,16 +461,7 @@ int DivPlatformQSound::dispatch(DivCommand c) {
       chan[c.chan].freqChanged=true;
       break;
     case DIV_CMD_NOTE_PORTA: {
-      double off=1.0;
-      if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
-        DivSample* s=parent->getSample(chan[c.chan].sample);
-        if (s->centerRate<1) {
-          off=1.0;
-        } else {
-          off=(double)s->centerRate/24038.0/16.0;
-        }
-      }
-      int destFreq=off*QS_NOTE_FREQUENCY(c.value2);
+      int destFreq=QS_NOTE_FREQUENCY(c.value2);
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
         chan[c.chan].baseFreq+=c.value;
@@ -499,16 +484,7 @@ int DivPlatformQSound::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_LEGATO: {
-      double off=1.0;
-      if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
-        DivSample* s=parent->getSample(chan[c.chan].sample);
-        if (s->centerRate<1) {
-          off=1.0;
-        } else {
-          off=(double)s->centerRate/24038.0/16.0;
-        }
-      }
-      chan[c.chan].baseFreq=off*QS_NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val-12):(0)));
+      chan[c.chan].baseFreq=QS_NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val-12):(0)));
       chan[c.chan].freqChanged=true;
       chan[c.chan].note=c.value;
       break;
diff --git a/src/engine/platform/saa.cpp b/src/engine/platform/saa.cpp
index 3ecf0a3e..ec5f4f6d 100644
--- a/src/engine/platform/saa.cpp
+++ b/src/engine/platform/saa.cpp
@@ -200,7 +200,7 @@ void DivPlatformSAA1099::tick(bool sysTick) {
       rWrite(0x18+(i/3),saaEnv[i/3]);
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (chan[i].freq>65535) chan[i].freq=65535;
       if (chan[i].freq>=32768) {
         chan[i].freqH=7;
@@ -311,13 +311,13 @@ int DivPlatformSAA1099::dispatch(DivCommand c) {
       int destFreq=NOTE_PERIODIC(c.value2);
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        chan[c.chan].baseFreq+=c.value*(8-chan[c.chan].freqH);
+        chan[c.chan].baseFreq+=c.value*((parent->song.linearPitch==2)?1:(8-chan[c.chan].freqH));
         if (chan[c.chan].baseFreq>=destFreq) {
           chan[c.chan].baseFreq=destFreq;
           return2=true;
         }
       } else {
-        chan[c.chan].baseFreq-=c.value*(8-chan[c.chan].freqH);
+        chan[c.chan].baseFreq-=c.value*((parent->song.linearPitch==2)?1:(8-chan[c.chan].freqH));
         if (chan[c.chan].baseFreq<=destFreq) {
           chan[c.chan].baseFreq=destFreq;
           return2=true;
diff --git a/src/engine/platform/scc.cpp b/src/engine/platform/scc.cpp
new file mode 100644
index 00000000..96ec2dfd
--- /dev/null
+++ b/src/engine/platform/scc.cpp
@@ -0,0 +1,391 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "scc.h"
+#include "../engine.h"
+#include <math.h>
+
+#define CHIP_DIVIDER 16
+
+#define rWrite(a,v) {if (!skipRegisterWrites) {scc->scc_w(true,a,v); regPool[a]=v; if (dumpWrites) addWrite(a,v); }}
+
+const char* regCheatSheetSCC[]={
+  "Ch1_Wave", "00",
+  "Ch2_Wave", "20",
+  "Ch3_Wave", "40",
+  "Ch4_5_Wave", "60",
+  "Ch1_FreqL", "80",
+  "Ch1_FreqH", "81",
+  "Ch2_FreqL", "82",
+  "Ch2_FreqH", "83",
+  "Ch3_FreqL", "84",
+  "Ch3_FreqH", "85",
+  "Ch4_FreqL", "86",
+  "Ch4_FreqH", "87",
+  "Ch5_FreqL", "88",
+  "Ch5_FreqH", "89",
+  "Ch1_Vol", "8a",
+  "Ch2_Vol", "8b",
+  "Ch3_Vol", "8c",
+  "Ch4_Vol", "8d",
+  "Ch5_Vol", "8e",
+  "Output", "8f",
+  "Test", "e0",
+  NULL
+};
+
+const char* regCheatSheetSCCPlus[]={
+  "Ch1_Wave", "00",
+  "Ch2_Wave", "20",
+  "Ch3_Wave", "40",
+  "Ch4_Wave", "60",
+  "Ch5_Wave", "80",
+  "Ch1_FreqL", "a0",
+  "Ch1_FreqH", "a1",
+  "Ch2_FreqL", "a2",
+  "Ch2_FreqH", "a3",
+  "Ch3_FreqL", "a4",
+  "Ch3_FreqH", "a5",
+  "Ch4_FreqL", "a6",
+  "Ch4_FreqH", "a7",
+  "Ch5_FreqL", "a8",
+  "Ch5_FreqH", "a9",
+  "Ch1_Vol", "aa",
+  "Ch2_Vol", "ab",
+  "Ch3_Vol", "ac",
+  "Ch4_Vol", "ad",
+  "Ch5_Vol", "ae",
+  "Output", "af",
+  "Test", "c0",
+  NULL
+};
+
+const char** DivPlatformSCC::getRegisterSheet() {
+  return isPlus ? regCheatSheetSCCPlus : regCheatSheetSCC;
+}
+
+const char* DivPlatformSCC::getEffectName(unsigned char effect) {
+  switch (effect) {
+    case 0x10:
+      return "10xx: Change waveform";
+      break;
+  }
+  return NULL;
+}
+
+void DivPlatformSCC::acquire(short* bufL, short* bufR, size_t start, size_t len) {
+  for (size_t h=start; h<start+len; h++) {
+    for (int i=0; i<16; i++) {
+      scc->tick();
+    }
+    short out=(short)scc->out()<<5;
+    bufL[h]=bufR[h]=out;
+
+    for (int i=0; i<5; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=scc->chan_out(i)<<7;
+    }
+  }
+}
+
+void DivPlatformSCC::updateWave(int ch) {
+  int dstCh=(!isPlus && ch>=4)?3:ch;
+  for (int i=0; i<32; i++) {
+    rWrite(dstCh*32+i,(unsigned char)chan[ch].ws.output[i]-128);
+  }
+}
+
+void DivPlatformSCC::tick(bool sysTick) {
+  for (int i=0; i<5; i++) {
+    chan[i].std.next();
+    if (chan[i].std.vol.had) {
+      chan[i].outVol=((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))/15;
+      rWrite(regBase+10+i,chan[i].outVol);
+    }
+    if (chan[i].std.arp.had) {
+      if (!chan[i].inPorta) {
+        if (chan[i].std.arp.mode) {
+          chan[i].baseFreq=NOTE_PERIODIC(chan[i].std.arp.val);
+        } else {
+          chan[i].baseFreq=NOTE_PERIODIC(chan[i].note+chan[i].std.arp.val);
+        }
+      }
+      chan[i].freqChanged=true;
+    } else {
+      if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
+        chan[i].baseFreq=NOTE_PERIODIC(chan[i].note);
+        chan[i].freqChanged=true;
+      }
+    }
+    if (chan[i].std.wave.had) {
+      if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
+        chan[i].wave=chan[i].std.wave.val;
+        chan[i].ws.changeWave1(chan[i].wave);
+      }
+    }
+    if (chan[i].std.pitch.had) {
+      if (chan[i].std.pitch.mode) {
+        chan[i].pitch2+=chan[i].std.pitch.val;
+        CLAMP_VAR(chan[i].pitch2,-2048,2048);
+      } else {
+        chan[i].pitch2=chan[i].std.pitch.val;
+      }
+      chan[i].freqChanged=true;
+    }
+    if (chan[i].active) {
+      if (chan[i].ws.tick()) {
+        updateWave(i);
+      }
+    }
+    if (chan[i].freqChanged) {
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER)-1;
+      if (chan[i].freq<0) chan[i].freq=0;
+      if (chan[i].freq>4095) chan[i].freq=4095;
+      rWrite(regBase+0+i*2,chan[i].freq&0xff);
+      rWrite(regBase+1+i*2,chan[i].freq>>8);
+      chan[i].freqChanged=false;
+    }
+  }
+}
+
+int DivPlatformSCC::dispatch(DivCommand c) {
+  switch (c.cmd) {
+    case DIV_CMD_NOTE_ON: {
+      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_SCC);
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
+        chan[c.chan].freqChanged=true;
+        chan[c.chan].note=c.value;
+      }
+      chan[c.chan].active=true;
+      chan[c.chan].macroInit(ins);
+      if (!isMuted[c.chan]) {
+        rWrite(regBase+15,regPool[regBase+15]|(1<<c.chan));
+      }
+      if (chan[c.chan].wave<0) {
+        chan[c.chan].wave=0;
+        chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+      }
+      chan[c.chan].ws.init(ins,32,255,chan[c.chan].insChanged);
+      chan[c.chan].insChanged=false;
+      break;
+    }
+    case DIV_CMD_NOTE_OFF:
+      chan[c.chan].active=false;
+      chan[c.chan].macroInit(NULL);
+      rWrite(regBase+15,regPool[regBase+15]&~(1<<c.chan));
+      break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_INSTRUMENT:
+      if (chan[c.chan].ins!=c.value || c.value2==1) {
+        chan[c.chan].ins=c.value;
+      }
+      break;
+    case DIV_CMD_VOLUME:
+      if (chan[c.chan].vol!=c.value) {
+        chan[c.chan].vol=c.value;
+        if (!chan[c.chan].std.vol.has) {
+          chan[c.chan].outVol=c.value;
+          rWrite(regBase+10+c.chan,c.value);
+        }
+      }
+      break;
+    case DIV_CMD_GET_VOLUME:
+      if (chan[c.chan].std.vol.has) {
+        return chan[c.chan].vol;
+      }
+      return chan[c.chan].outVol;
+      break;
+    case DIV_CMD_PITCH:
+      chan[c.chan].pitch=c.value;
+      chan[c.chan].freqChanged=true;
+      break;
+    case DIV_CMD_WAVE:
+      chan[c.chan].wave=c.value;
+      chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+      break;
+    case DIV_CMD_NOTE_PORTA: {
+      int destFreq=NOTE_PERIODIC(c.value2);
+      bool return2=false;
+      if (destFreq>chan[c.chan].baseFreq) {
+        chan[c.chan].baseFreq+=c.value;
+        if (chan[c.chan].baseFreq>=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      } else {
+        chan[c.chan].baseFreq-=c.value;
+        if (chan[c.chan].baseFreq<=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      }
+      chan[c.chan].freqChanged=true;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
+      break;
+    }
+    case DIV_CMD_LEGATO:
+      chan[c.chan].baseFreq=NOTE_PERIODIC(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val):(0)));
+      chan[c.chan].freqChanged=true;
+      chan[c.chan].note=c.value;
+      break;
+    case DIV_CMD_PRE_PORTA:
+      if (chan[c.chan].active && c.value2) {
+        if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_SCC));
+      }
+      chan[c.chan].inPorta=c.value;
+      break;
+    case DIV_CMD_GET_VOLMAX:
+      return 15;
+      break;
+    case DIV_ALWAYS_SET_VOLUME:
+      return 1;
+      break;
+    default:
+      break;
+  }
+  return 1;
+}
+
+void DivPlatformSCC::muteChannel(int ch, bool mute) {
+  isMuted[ch]=mute;
+  if (mute) {
+    rWrite(regBase+15,regPool[regBase+15]&~(1<<ch));
+  } else if (chan[ch].active) {
+    rWrite(regBase+15,regPool[regBase+15]|(1<<ch));
+  }
+}
+
+void DivPlatformSCC::forceIns() {
+  for (int i=0; i<5; i++) {
+    chan[i].insChanged=true;
+    chan[i].freqChanged=true;
+    if (chan[i].active) {
+      updateWave(i);
+    }
+  }
+}
+
+void* DivPlatformSCC::getChanState(int ch) {
+  return &chan[ch];
+}
+
+DivDispatchOscBuffer* DivPlatformSCC::getOscBuffer(int ch) {
+  return oscBuf[ch];
+}
+
+unsigned char* DivPlatformSCC::getRegisterPool() {
+  return (unsigned char*)regPool;
+}
+
+int DivPlatformSCC::getRegisterPoolSize() {
+  return 225;
+}
+
+void DivPlatformSCC::reset() {
+  memset(regPool,0,225);
+  scc->reset();
+  for (int i=0; i<5; i++) {
+    chan[i]=DivPlatformSCC::Channel();
+    chan[i].std.setEngine(parent);
+    chan[i].ws.setEngine(parent);
+    chan[i].ws.init(NULL,32,255,false);
+    chan[i].vol=15;
+    chan[i].outVol=15;
+    rWrite(regBase+10+i,15);
+  }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
+}
+
+bool DivPlatformSCC::isStereo() {
+  return false;
+}
+
+void DivPlatformSCC::notifyWaveChange(int wave) {
+  for (int i=0; i<5; i++) {
+    if (chan[i].wave==wave) {
+      chan[i].ws.changeWave1(chan[i].wave);
+      if (chan[i].active) {
+        updateWave(i);
+      }
+    }
+  }
+}
+
+void DivPlatformSCC::notifyInsDeletion(void* ins) {
+  for (int i=0; i<5; i++) {
+    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
+  }
+}
+
+void DivPlatformSCC::poke(unsigned int addr, unsigned short val) {
+  rWrite(addr,val);
+}
+
+void DivPlatformSCC::poke(std::vector<DivRegWrite>& wlist) {
+  for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
+}
+
+void DivPlatformSCC::setChipModel(bool isplus) {
+  isPlus=isplus;
+}
+
+int DivPlatformSCC::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
+  parent=p;
+  dumpWrites=false;
+  skipRegisterWrites=false;
+  writeOscBuf=0;
+  for (int i=0; i<5; i++) {
+    isMuted[i]=false;
+    oscBuf[i]=new DivDispatchOscBuffer;
+  }
+  chipClock=COLOR_NTSC/2.0;
+  rate=chipClock/8;
+  for (int i=0; i<5; i++) {
+    oscBuf[i]->rate=rate;
+  }
+  if (isPlus) {
+    scc=new k052539_scc_core;
+    regBase=0xa0;
+  } else {
+    scc=new k051649_scc_core;
+    regBase=0x80;
+  }
+  reset();
+  return 5;
+}
+
+void DivPlatformSCC::quit() {
+  for (int i=0; i<5; i++) {
+    delete oscBuf[i];
+  }
+  if (scc!=NULL) {
+    delete scc;
+  }
+}
+
+DivPlatformSCC::~DivPlatformSCC() {
+}
diff --git a/src/engine/platform/scc.h b/src/engine/platform/scc.h
new file mode 100644
index 00000000..58059532
--- /dev/null
+++ b/src/engine/platform/scc.h
@@ -0,0 +1,91 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _SCC_H
+#define _SCC_H
+
+#include "../dispatch.h"
+#include <queue>
+#include "../macroInt.h"
+#include "../waveSynth.h"
+#include "sound/scc/scc.hpp"
+
+class DivPlatformSCC: public DivDispatch {
+  struct Channel {
+    int freq, baseFreq, pitch, pitch2, note, ins;
+    bool active, insChanged, freqChanged, inPorta;
+    signed char vol, outVol, wave;
+    signed char waveROM[32] = {0}; // 4 bit PROM per channel on bubble system
+    DivMacroInt std;
+    DivWaveSynth ws;
+    void macroInit(DivInstrument* which) {
+      std.init(which);
+      pitch2=0;
+    }
+    Channel():
+      freq(0),
+      baseFreq(0),
+      pitch(0),
+      pitch2(0),
+      note(0),
+      ins(-1),
+      active(false),
+      insChanged(true),
+      freqChanged(false),
+      inPorta(false),
+      vol(15),
+      outVol(15),
+      wave(-1) {}
+  };
+  Channel chan[5];
+  DivDispatchOscBuffer* oscBuf[5];
+  bool isMuted[5];
+  unsigned char writeOscBuf;
+
+  scc_core* scc;
+  bool isPlus;
+  unsigned char regBase;
+  unsigned char regPool[225];
+  void updateWave(int ch);
+  friend void putDispatchChan(void*,int,int);
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    void notifyWaveChange(int wave);
+    void notifyInsDeletion(void* ins);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void setChipModel(bool isPlus);
+    void quit();
+    ~DivPlatformSCC();
+};
+
+#endif
diff --git a/src/engine/platform/sms.cpp b/src/engine/platform/sms.cpp
index f1c66163..be2039cf 100644
--- a/src/engine/platform/sms.cpp
+++ b/src/engine/platform/sms.cpp
@@ -121,7 +121,7 @@ void DivPlatformSMS::tick(bool sysTick) {
   }
   for (int i=0; i<3; i++) {
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,64);
       if (chan[i].freq>1023) chan[i].freq=1023;
       if (chan[i].freq<8) chan[i].freq=1;
       //if (chan[i].actualNote>0x5d) chan[i].freq=0x01;
@@ -136,7 +136,7 @@ void DivPlatformSMS::tick(bool sysTick) {
     }
   }
   if (chan[3].freqChanged || updateSNMode) {
-    chan[3].freq=parent->calcFreq(chan[3].baseFreq,chan[3].pitch,true,0,chan[3].pitch2);
+    chan[3].freq=parent->calcFreq(chan[3].baseFreq,chan[3].pitch,true,0,chan[3].pitch2,chipClock,isRealSN?60:64);
     if (chan[3].freq>1023) chan[3].freq=1023;
     if (chan[3].actualNote>0x5d) chan[3].freq=0x01;
     if (snNoiseMode&2) { // take period from channel 3
diff --git a/src/engine/platform/sound/scc/scc.cpp b/src/engine/platform/sound/scc/scc.cpp
new file mode 100644
index 00000000..db74d3f0
--- /dev/null
+++ b/src/engine/platform/sound/scc/scc.cpp
@@ -0,0 +1,612 @@
+/*
+	License: BSD-3-Clause
+	see https://github.com/cam900/vgsound_emu/LICENSE for more details
+
+	Copyright holder(s): cam900
+	Konami SCC emulation core
+
+	Konami SCC means "Sound Creative Chip", it's actually MSX MegaROM/RAM Mapper with 5 channel Wavetable sound generator.
+
+	It was first appeared at 1987, F-1 Spirit and Nemesis 2/Gradius 2 for MSX. then several MSX cartridges used that until 1990, Metal Gear 2: Solid Snake.
+	Even after MSX is discontinued, it was still used at some low-end arcade and amusement hardwares.
+	and some Third-party MSX utilities still support this due to its market shares.
+
+	There's 2 SCC types:
+
+	K051649 (or simply known as SCC)
+	This chip is used for MSX MegaROM Mapper, some arcade machines.
+	Channel 4 and 5 must be share waveform, other channels has its own waveforms.
+
+	K052539 (also known as SCC+)
+	This chip is used for MSX MegaRAM Mapper (Konami Sound Cartridges for Snatcher/SD Snatcher).
+	All channels can be has its own waveforms, and also has backward compatibility mode with K051649.
+
+	Based on:
+		https://www.msx.org/wiki/MegaROM_Mappers
+		https://www.msx.org/wiki/Konami_051649
+		https://www.msx.org/wiki/Konami_052539
+		http://bifi.msxnet.org/msxnet/tech/scc
+		http://bifi.msxnet.org/msxnet/tech/soundcartridge
+
+	K051649 Register Layout
+
+	--------------------------------------------------------------------
+
+	4000-bfff MegaROM Mapper
+
+	--------------------------------------------------------------------
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	4000-5fff xxxx xxxx R   Bank page 0
+	c000-dfff mirror of 4000-5fff
+
+	6000-7fff xxxx xxxx R   Bank page 1
+	e000-ffff mirror of 6000-7fff
+
+	8000-9fff xxxx xxxx R   Bank page 2
+	0000-1fff mirror of 8000-9fff
+
+	a000-bfff xxxx xxxx R   Bank page 3
+	2000-3fff mirror of a000-bfff
+
+	--------------------------------------------------------------------
+
+	5000-57ff, 7000-77ff, 9000-97ff, b000-b7ff Bank select
+
+	--------------------------------------------------------------------
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	5000      --xx xxxx   W Bank select, Page 0
+	5001-57ff Mirror of 5000
+
+	7000      --xx xxxx   W Bank select, Page 1
+	7001-77ff Mirror of 7000
+
+	9000      --xx xxxx   W Bank select, Page 2
+	          --11 1111   W SCC Enable
+	9001-97ff Mirror of 9000
+
+	b000      --xx xxxx   W Bank select, Page 3
+	b001-b7ff Mirror of b000
+
+	--------------------------------------------------------------------
+
+	9800-9fff SCC register
+
+	--------------------------------------------------------------------
+
+	9800-987f Waveform
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	9800-981f xxxx xxxx R/W Channel 0 Waveform (32 byte, 8 bit signed)
+	9820-983f xxxx xxxx R/W Channel 1 ""
+	9840-985f xxxx xxxx R/W Channel 2 ""
+	9860-987f xxxx xxxx R/W Channel 3/4 ""
+
+	9880-9889 Pitch
+
+	9880      xxxx xxxx   W Channel 0 Pitch LSB
+	9881      ---- xxxx   W Channel 0 Pitch MSB
+	9882      xxxx xxxx   W Channel 1 Pitch LSB
+	9883      ---- xxxx   W Channel 1 Pitch MSB
+	9884      xxxx xxxx   W Channel 2 Pitch LSB
+	9885      ---- xxxx   W Channel 2 Pitch MSB
+	9886      xxxx xxxx   W Channel 3 Pitch LSB
+	9887      ---- xxxx   W Channel 3 Pitch MSB
+	9888      xxxx xxxx   W Channel 4 Pitch LSB
+	9889      ---- xxxx   W Channel 4 Pitch MSB
+
+	9888-988e Volume
+
+	988a      ---- xxxx   W Channel 0 Volume
+	988b      ---- xxxx   W Channel 1 Volume
+	988c      ---- xxxx   W Channel 2 Volume
+	988d      ---- xxxx   W Channel 3 Volume
+	988e      ---- xxxx   W Channel 4 Volume
+
+	988f      ---x ----   W Channel 4 Output enable/disable flag
+	          ---- x---   W Channel 3 Output enable/disable flag
+	          ---- -x--   W Channel 2 Output enable/disable flag
+	          ---- --x-   W Channel 1 Output enable/disable flag
+	          ---- ---x   W Channel 0 Output enable/disable flag
+
+	9890-989f Mirror of 9880-988f
+
+	98a0-98bf xxxx xxxx R   Channel 4 Waveform
+
+	98e0      x--- ----   W Waveform rotate flag for channel 4
+	          -x-- ----   W Waveform rotate flag for all channels
+	          --x- ----   W Reset waveform position after pitch writes
+	          ---- --x-   W 8 bit frequency
+	          ---- --0x   W 4 bit frequency
+
+	98e1-98ff Mirror of 98e0
+
+	9900-9fff Mirror of 9800-98ff
+
+	--------------------------------------------------------------------
+
+	K052539 Register Layout
+
+	--------------------------------------------------------------------
+
+	4000-bfff MegaRAM Mapper
+
+	--------------------------------------------------------------------
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	4000-5fff xxxx xxxx R/W Bank page 0
+	c000-dfff xxxx xxxx R/W ""
+
+	6000-7fff xxxx xxxx R/W Bank page 1
+	e000-ffff xxxx xxxx R/W ""
+
+	8000-9fff xxxx xxxx R/W Bank page 2
+	0000-1fff xxxx xxxx R/W ""
+
+	a000-bfff xxxx xxxx R/W Bank page 3
+	2000-3fff xxxx xxxx R/W ""
+
+	--------------------------------------------------------------------
+
+	5000-57ff, 7000-77ff, 9000-97ff, b000-b7ff Bank select
+
+	--------------------------------------------------------------------
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	5000      xxxx xxxx   W Bank select, Page 0
+	5001-57ff Mirror of 5000
+
+	7000      xxxx xxxx   W Bank select, Page 1
+	7001-77ff Mirror of 7000
+
+	9000      xxxx xxxx   W Bank select, Page 2
+	          --11 1111   W SCC Enable (SCC Compatible mode)
+	9001-97ff Mirror of 9000
+
+	b000      xxxx xxxx   W Bank select, Page 3
+	          1--- ----   W SCC+ Enable (SCC+ mode)
+	b001-b7ff Mirror of b000
+
+	--------------------------------------------------------------------
+
+	bffe-bfff Mapper configuration
+
+	--------------------------------------------------------------------
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	bffe      --x- ----   W SCC operation mode
+	          --0- ----   W SCC Compatible mode
+	          --1- ----   W SCC+ mode
+	          ---x ----   W RAM write/Bank select toggle for all Bank pages
+						---0 ----   W Bank select enable
+						---1 ----   W RAM write enable
+						---0 -x--   W RAM write/Bank select toggle for Bank page 2
+						---0 --x-   W RAM write/Bank select toggle for Bank page 1
+						---0 ---x   W RAM write/Bank select toggle for Bank page 0
+	bfff Mirror of bffe
+
+	--------------------------------------------------------------------
+
+	9800-9fff SCC Compatible mode register
+
+	--------------------------------------------------------------------
+
+	9800-987f Waveform
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	9800-981f xxxx xxxx R/W Channel 0 Waveform (32 byte, 8 bit signed)
+	9820-983f xxxx xxxx R/W Channel 1 ""
+	9840-985f xxxx xxxx R/W Channel 2 ""
+	9860-987f xxxx xxxx R/W Channel 3/4 ""
+
+	9880-9889 Pitch
+
+	9880      xxxx xxxx   W Channel 0 Pitch LSB
+	9881      ---- xxxx   W Channel 0 Pitch MSB
+	9882      xxxx xxxx   W Channel 1 Pitch LSB
+	9883      ---- xxxx   W Channel 1 Pitch MSB
+	9884      xxxx xxxx   W Channel 2 Pitch LSB
+	9885      ---- xxxx   W Channel 2 Pitch MSB
+	9886      xxxx xxxx   W Channel 3 Pitch LSB
+	9887      ---- xxxx   W Channel 3 Pitch MSB
+	9888      xxxx xxxx   W Channel 4 Pitch LSB
+	9889      ---- xxxx   W Channel 4 Pitch MSB
+
+	9888-988e Volume
+
+	988a      ---- xxxx   W Channel 0 Volume
+	988b      ---- xxxx   W Channel 1 Volume
+	988c      ---- xxxx   W Channel 2 Volume
+	988d      ---- xxxx   W Channel 3 Volume
+	988e      ---- xxxx   W Channel 4 Volume
+
+	988f      ---x ----   W Channel 4 Output enable/disable flag
+	          ---- x---   W Channel 3 Output enable/disable flag
+	          ---- -x--   W Channel 2 Output enable/disable flag
+	          ---- --x-   W Channel 1 Output enable/disable flag
+	          ---- ---x   W Channel 0 Output enable/disable flag
+
+	9890-989f Mirror of 9880-988f
+
+	98a0-98bf xxxx xxxx R   Channel 4 Waveform
+
+	98c0      -x-- ----   W Waveform rotate flag for all channels
+	          --x- ----   W Reset waveform position after pitch writes
+	          ---- --x-   W 8 bit frequency
+	          ---- --0x   W 4 bit frequency
+
+	98c1-98df Mirror of 98c0
+
+	9900-9fff Mirror of 9800-98ff
+
+	--------------------------------------------------------------------
+
+	b800-bfff SCC+ mode register
+
+	--------------------------------------------------------------------
+
+	b800-b89f Waveform
+
+	Address   Bit       R/W Description
+	          7654 3210
+
+	b800-b81f xxxx xxxx R/W Channel 0 Waveform (32 byte, 8 bit signed)
+	b820-b83f xxxx xxxx R/W Channel 1 ""
+	b840-b85f xxxx xxxx R/W Channel 2 ""
+	b860-b87f xxxx xxxx R/W Channel 3 ""
+	b880-b89f xxxx xxxx R/W Channel 3 ""
+
+	b8a0-b8a9 Pitch
+
+	b8a0      xxxx xxxx   W Channel 0 Pitch LSB
+	b8a1      ---- xxxx   W Channel 0 Pitch MSB
+	b8a2      xxxx xxxx   W Channel 1 Pitch LSB
+	b8a3      ---- xxxx   W Channel 1 Pitch MSB
+	b8a4      xxxx xxxx   W Channel 2 Pitch LSB
+	b8a5      ---- xxxx   W Channel 2 Pitch MSB
+	b8a6      xxxx xxxx   W Channel 3 Pitch LSB
+	b8a7      ---- xxxx   W Channel 3 Pitch MSB
+	b8a8      xxxx xxxx   W Channel 4 Pitch LSB
+	b8a9      ---- xxxx   W Channel 4 Pitch MSB
+
+	b8a8-b8ae Volume
+
+	b8aa      ---- xxxx   W Channel 0 Volume
+	b8ab      ---- xxxx   W Channel 1 Volume
+	b8ac      ---- xxxx   W Channel 2 Volume
+	b8ad      ---- xxxx   W Channel 3 Volume
+	b8ae      ---- xxxx   W Channel 4 Volume
+
+	b8af      ---x ----   W Channel 4 Output enable/disable flag
+	          ---- x---   W Channel 3 Output enable/disable flag
+	          ---- -x--   W Channel 2 Output enable/disable flag
+	          ---- --x-   W Channel 1 Output enable/disable flag
+	          ---- ---x   W Channel 0 Output enable/disable flag
+
+	b8b0-b8bf Mirror of b8a0-b8af
+
+	b8c0      -x-- ----   W Waveform rotate flag for all channels
+	          --x- ----   W Reset waveform position after pitch writes
+	          ---- --x-   W 8 bit frequency
+	          ---- --0x   W 4 bit frequency
+
+	b8c1-b8df Mirror of b8c0
+
+	b900-bfff Mirror of b800-b8ff
+
+	--------------------------------------------------------------------
+
+	SCC Frequency calculation:
+	if 8 bit frequency then
+		Frequency = Input clock / ((bit 0 to 7 of Pitch input) + 1)
+	else if 4 bit frequency then
+		Frequency = Input clock / ((bit 8 to 11 of Pitch input) + 1)
+	else
+		Frequency = Input clock / (Pitch input + 1)
+
+*/
+
+#include "scc.hpp"
+
+// shared SCC features
+void scc_core::tick()
+{
+	m_out = 0;
+	for (auto & elem : m_voice)
+	{
+		elem.tick();
+		m_out += elem.out;
+	}
+}
+
+void scc_core::voice_t::tick()
+{
+	if (pitch >= 9) // or voice is halted
+	{
+		// update counter - Post decrement
+		u16 temp = counter;
+		if (m_host.m_test.freq_4bit) // 4 bit frequency mode
+		{
+			counter = (counter & ~0x0ff) | (bitfield(bitfield(counter, 0, 8) - 1, 0, 8) << 0);
+			counter = (counter & ~0xf00) | (bitfield(bitfield(counter, 8, 4) - 1, 0, 4) << 8);
+		}
+		else
+			counter = bitfield(counter - 1, 0, 12);
+
+		// handle counter carry
+		bool carry = m_host.m_test.freq_8bit ? (bitfield(temp, 0, 8) == 0) :
+		            (m_host.m_test.freq_4bit ? (bitfield(temp, 8, 4) == 0) :
+								(bitfield(temp, 0, 12) == 0));
+		if (carry)
+		{
+			addr = bitfield(addr + 1, 0, 5);
+			counter = pitch;
+		}
+	}
+	// get output
+	if (enable)
+		out = (wave[addr] * volume) >> 4; // scale to 11 bit digital output
+	else
+		out = 0;
+}
+
+void scc_core::reset()
+{
+	for (auto & elem : m_voice)
+		elem.reset();
+
+	m_test.reset();
+	m_out = 0;
+	std::fill(std::begin(m_reg), std::end(m_reg), 0);
+}
+
+void scc_core::voice_t::reset()
+{
+	std::fill(std::begin(wave), std::end(wave), 0);
+	enable = false;
+	pitch = 0;
+	volume = 0;
+	addr = 0;
+	counter = 0;
+	out = 0;
+}
+
+// SCC accessors
+u8 scc_core::wave_r(bool is_sccplus, u8 address)
+{
+	u8 ret = 0xff;
+	const u8 voice = bitfield(address, 5, 3);
+	if (voice > 4)
+		return ret;
+
+	u8 wave_addr = bitfield(address, 0, 5);
+
+	if (m_test.rotate) // rotate flag
+		wave_addr = bitfield(wave_addr + m_voice[voice].addr, 0, 5);
+
+	if (!is_sccplus)
+	{
+		if (voice == 3) // rotate voice 3~4 flag
+		{
+			if (m_test.rotate4 || m_test.rotate) // rotate flag
+				wave_addr = bitfield(bitfield(address, 0, 5) + m_voice[3 + m_test.rotate].addr, 0, 5);
+		}
+	}
+	ret = m_voice[voice].wave[wave_addr];
+
+	return ret;
+}
+
+void scc_core::wave_w(bool is_sccplus, u8 address, u8 data)
+{
+	if (m_test.rotate) // write protected
+		return;
+
+	const u8 voice = bitfield(address, 5, 3);
+	if (voice > 4)
+		return;
+
+	const u8 wave_addr = bitfield(address, 0, 5);
+
+	if (!is_sccplus)
+	{
+		if (((voice >= 3) && m_test.rotate4) || (voice >= 4)) // Ignore if write protected, or voice 4
+			return;
+		if (voice >= 3) // voice 3, 4 shares waveform
+		{
+			m_voice[3].wave[wave_addr] = data;
+			m_voice[4].wave[wave_addr] = data;
+		}
+		else
+			m_voice[voice].wave[wave_addr] = data;
+	}
+	else
+		m_voice[voice].wave[wave_addr] = data;
+}
+
+void scc_core::freq_vol_enable_w(u8 address, u8 data)
+{
+	const u8 voice_freq = bitfield(address, 1, 3);
+	const u8 voice_reg = bitfield(address, 0, 4);
+	// *0-*f Pitch, Volume, Enable
+	switch (voice_reg)
+	{
+		case 0x0: // 0x*0 Voice 0 Pitch LSB
+		case 0x2: // 0x*2 Voice 1 Pitch LSB
+		case 0x4: // 0x*4 Voice 2 Pitch LSB
+		case 0x6: // 0x*6 Voice 3 Pitch LSB
+		case 0x8: // 0x*8 Voice 4 Pitch LSB
+			if (m_test.resetpos) // Reset address
+				m_voice[voice_freq].addr = 0;
+			m_voice[voice_freq].pitch = (m_voice[voice_freq].pitch & ~0x0ff) | data;
+			break;
+		case 0x1: // 0x*1 Voice 0 Pitch MSB
+		case 0x3: // 0x*3 Voice 1 Pitch MSB
+		case 0x5: // 0x*5 Voice 2 Pitch MSB
+		case 0x7: // 0x*7 Voice 3 Pitch MSB
+		case 0x9: // 0x*9 Voice 4 Pitch MSB
+			if (m_test.resetpos) // Reset address
+				m_voice[voice_freq].addr = 0;
+			m_voice[voice_freq].pitch = (m_voice[voice_freq].pitch & ~0xf00) | (u16(bitfield(data, 0, 4)) << 8);
+			break;
+		case 0xa: // 0x*a Voice 0 Volume
+		case 0xb: // 0x*b Voice 1 Volume
+		case 0xc: // 0x*c Voice 2 Volume
+		case 0xd: // 0x*d Voice 3 Volume
+		case 0xe: // 0x*e Voice 4 Volume
+			m_voice[voice_reg - 0xa].volume = bitfield(data, 0, 4);
+			break;
+		case 0xf: // 0x*f Enable/Disable flag
+			m_voice[0].enable = bitfield(data, 0);
+			m_voice[1].enable = bitfield(data, 1);
+			m_voice[2].enable = bitfield(data, 2);
+			m_voice[3].enable = bitfield(data, 3);
+			m_voice[4].enable = bitfield(data, 4);
+			break;
+	}
+}
+
+void k051649_scc_core::scc_w(bool is_sccplus, u8 address, u8 data)
+{
+	const u8 voice = bitfield(address, 5, 3);
+	switch (voice)
+	{
+		case 0b000: // 0x00-0x1f Voice 0 Waveform
+		case 0b001: // 0x20-0x3f Voice 1 Waveform
+		case 0b010: // 0x40-0x5f Voice 2 Waveform
+		case 0b011: // 0x60-0x7f Voice 3/4 Waveform
+			wave_w(false, address, data);
+			break;
+		case 0b100: // 0x80-0x9f Pitch, Volume, Enable
+			freq_vol_enable_w(address, data);
+			break;
+		case 0b111: // 0xe0-0xff Test register
+			m_test.freq_4bit = bitfield(data, 0);
+			m_test.freq_8bit = bitfield(data, 1);
+			m_test.resetpos = bitfield(data, 5);
+			m_test.rotate = bitfield(data, 6);
+			m_test.rotate4 = bitfield(data, 7);
+			break;
+	}
+	m_reg[address] = data;
+}
+
+void k052539_scc_core::scc_w(bool is_sccplus, u8 address, u8 data)
+{
+	const u8 voice = bitfield(address, 5, 3);
+	if (is_sccplus)
+	{
+		switch (voice)
+		{
+			case 0b000: // 0x00-0x1f Voice 0 Waveform
+			case 0b001: // 0x20-0x3f Voice 1 Waveform
+			case 0b010: // 0x40-0x5f Voice 2 Waveform
+			case 0b011: // 0x60-0x7f Voice 3 Waveform
+			case 0b100: // 0x80-0x9f Voice 4 Waveform
+				wave_w(true, address, data);
+				break;
+			case 0b101: // 0xa0-0xbf Pitch, Volume, Enable
+				freq_vol_enable_w(address, data);
+				break;
+			case 0b110: // 0xc0-0xdf Test register
+				m_test.freq_4bit = bitfield(data, 0);
+				m_test.freq_8bit = bitfield(data, 1);
+				m_test.resetpos = bitfield(data, 5);
+				m_test.rotate = bitfield(data, 6);
+				break;
+			default:
+				break;
+		}
+	}
+	else
+	{
+		switch (voice)
+		{
+			case 0b000: // 0x00-0x1f Voice 0 Waveform
+			case 0b001: // 0x20-0x3f Voice 1 Waveform
+			case 0b010: // 0x40-0x5f Voice 2 Waveform
+			case 0b011: // 0x60-0x7f Voice 3/4 Waveform
+				wave_w(false, address, data);
+				break;
+			case 0b100: // 0x80-0x9f Pitch, Volume, Enable
+				freq_vol_enable_w(address, data);
+				break;
+			case 0b110: // 0xc0-0xdf Test register
+				m_test.freq_4bit = bitfield(data, 0);
+				m_test.freq_8bit = bitfield(data, 1);
+				m_test.resetpos = bitfield(data, 5);
+				m_test.rotate = bitfield(data, 6);
+				break;
+			default:
+				break;
+		}
+	}
+	m_reg[address] = data;
+}
+
+u8 k051649_scc_core::scc_r(bool is_sccplus, u8 address)
+{
+	const u8 voice = bitfield(address, 5, 3);
+	const u8 wave = bitfield(address, 0, 5);
+	u8 ret = 0xff;
+	switch (voice)
+	{
+		case 0b000: // 0x00-0x1f Voice 0 Waveform
+		case 0b001: // 0x20-0x3f Voice 1 Waveform
+		case 0b010: // 0x40-0x5f Voice 2 Waveform
+		case 0b011: // 0x60-0x7f Voice 3 Waveform
+		case 0b101: // 0xa0-0xbf Voice 4 Waveform
+			ret = wave_r(false, (std::min<u8>(4, voice) << 5) | wave);
+			break;
+	}
+	return ret;
+}
+
+u8 k052539_scc_core::scc_r(bool is_sccplus, u8 address)
+{
+	const u8 voice = bitfield(address, 5, 3);
+	const u8 wave = bitfield(address, 0, 5);
+	u8 ret = 0xff;
+	if (is_sccplus)
+	{
+		switch (voice)
+		{
+			case 0b000: // 0x00-0x1f Voice 0 Waveform
+			case 0b001: // 0x20-0x3f Voice 1 Waveform
+			case 0b010: // 0x40-0x5f Voice 2 Waveform
+			case 0b011: // 0x60-0x7f Voice 3 Waveform
+			case 0b100: // 0x80-0x9f Voice 4 Waveform
+				ret = wave_r(true, address);
+				break;
+		}
+	}
+	else
+	{
+		switch (voice)
+		{
+			case 0b000: // 0x00-0x1f Voice 0 Waveform
+			case 0b001: // 0x20-0x3f Voice 1 Waveform
+			case 0b010: // 0x40-0x5f Voice 2 Waveform
+			case 0b011: // 0x60-0x7f Voice 3 Waveform
+			case 0b101: // 0xa0-0xbf Voice 4 Waveform
+				ret = wave_r(false, (std::min<u8>(4, voice) << 5) | wave);
+				break;
+		}
+	}
+	return ret;
+}
diff --git a/src/engine/platform/sound/scc/scc.hpp b/src/engine/platform/sound/scc/scc.hpp
new file mode 100644
index 00000000..e696c403
--- /dev/null
+++ b/src/engine/platform/sound/scc/scc.hpp
@@ -0,0 +1,137 @@
+/*
+	License: BSD-3-Clause
+	see https://github.com/cam900/vgsound_emu/LICENSE for more details
+
+	Copyright holder(s): cam900
+	Konami SCC emulation core
+
+	See scc.cpp for more info.
+*/
+
+#include <algorithm>
+#include <memory>
+
+#ifndef _VGSOUND_EMU_SCC_HPP
+#define _VGSOUND_EMU_SCC_HPP
+
+#pragma once
+
+namespace scc
+{
+	typedef unsigned char       u8;
+	typedef signed char         s8;
+	typedef unsigned short     u16;
+	typedef signed short       s16;
+	typedef unsigned int       u32;
+	typedef signed int         s32;
+
+	// get bitfield, bitfield(input, position, len)
+	template<typename T> T bitfield(T in, u8 pos, u8 len = 1)
+	{
+		return (in >> pos) & (len ? (T(1 << len) - 1) : 1);
+	}
+}
+
+using namespace scc;
+// shared for SCCs
+class scc_core
+{
+public:
+	// constructor
+	scc_core()
+		: m_voice{*this,*this,*this,*this,*this}
+	{};
+	virtual ~scc_core(){};
+
+	// accessors
+	virtual u8 scc_r(bool is_sccplus, u8 address) = 0;
+	virtual void scc_w(bool is_sccplus, u8 address, u8 data) = 0;
+
+	// internal state
+	virtual void reset();
+	void tick();
+
+	// getters
+	s32 out() { return m_out; } // output to DA0...DA10 pin
+	s32 chan_out(u8 ch) { return m_voice[ch].out; }
+	u8 reg(u8 address) { return m_reg[address]; }
+
+protected:
+	// voice structs
+	struct voice_t
+	{
+		// constructor
+		voice_t(scc_core &host) : m_host(host) {};
+
+		// internal state
+		void reset();
+		void tick();
+
+		// registers
+		scc_core &m_host;
+		s8 wave[32] = {0};   // internal waveform
+		bool enable = false; // output enable flag
+		u16 pitch = 0;       // pitch
+		u8 volume = 0;       // volume
+		u8 addr = 0;         // waveform pointer
+		u16 counter = 0;     // frequency counter
+		s32 out = 0;         // current output
+	};
+	voice_t m_voice[5];    // 5 voices
+
+	// accessor
+	u8 wave_r(bool is_sccplus, u8 address);
+	void wave_w(bool is_sccplus, u8 address, u8 data);
+	void freq_vol_enable_w(u8 address, u8 data);
+
+	struct test_t
+	{
+		// constructor
+		test_t()
+			: freq_4bit(0)
+			, freq_8bit(0)
+			, resetpos(0)
+			, rotate(0)
+			, rotate4(0)
+		{ };
+
+		void reset()
+		{
+			freq_4bit = 0;
+			freq_8bit = 0;
+			resetpos = 0;
+			rotate = 0;
+			rotate4 = 0;
+		}
+
+		u8 freq_4bit : 1; // 4 bit frequency
+		u8 freq_8bit : 1; // 8 bit frequency
+		u8 resetpos  : 1; // reset counter after pitch writes
+		u8 rotate    : 1; // rotate and write protect waveform for all channels
+		u8 rotate4   : 1; // same as above but for channel 4 only
+	};
+
+	test_t m_test;         // test register
+	s32 m_out = 0;         // output to DA0...10
+
+	u8 m_reg[256] = {0};   // register pool
+};
+
+// SCC core
+class k051649_scc_core : public scc_core
+{
+public:
+	// accessors
+	virtual u8 scc_r(bool is_sccplus, u8 address) override;
+	virtual void scc_w(bool is_sccplus, u8 address, u8 data) override;
+};
+
+class k052539_scc_core : public k051649_scc_core
+{
+public:
+	// accessors
+	virtual u8 scc_r(bool is_sccplus, u8 address) override;
+	virtual void scc_w(bool is_sccplus, u8 address, u8 data) override;
+};
+
+#endif
diff --git a/src/engine/platform/su.cpp b/src/engine/platform/su.cpp
index e80153f0..4af60554 100644
--- a/src/engine/platform/su.cpp
+++ b/src/engine/platform/su.cpp
@@ -183,7 +183,7 @@ void DivPlatformSoundUnit::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_SU);
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].pcm) {
         DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_SU);
         DivSample* sample=parent->getSample(ins->amiga.initSample);
@@ -298,13 +298,13 @@ int DivPlatformSoundUnit::dispatch(DivCommand c) {
       int destFreq=NOTE_FREQUENCY(c.value2);
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        chan[c.chan].baseFreq+=c.value*(1+(chan[c.chan].baseFreq>>9));
+        chan[c.chan].baseFreq+=c.value*((parent->song.linearPitch==2)?1:(1+(chan[c.chan].baseFreq>>9)));
         if (chan[c.chan].baseFreq>=destFreq) {
           chan[c.chan].baseFreq=destFreq;
           return2=true;
         }
       } else {
-        chan[c.chan].baseFreq-=c.value*(1+(chan[c.chan].baseFreq>>9));
+        chan[c.chan].baseFreq-=c.value*((parent->song.linearPitch==2)?1:(1+(chan[c.chan].baseFreq>>9)));
         if (chan[c.chan].baseFreq<=destFreq) {
           chan[c.chan].baseFreq=destFreq;
           return2=true;
diff --git a/src/engine/platform/swan.cpp b/src/engine/platform/swan.cpp
index 97aa7b9e..b089394a 100644
--- a/src/engine/platform/swan.cpp
+++ b/src/engine/platform/swan.cpp
@@ -203,7 +203,7 @@ void DivPlatformSwan::tick(bool sysTick) {
       }
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (i==1 && pcm && furnaceDac) {
         double off=1.0;
         if (dacSample>=0 && dacSample<parent->song.sampleLen) {
diff --git a/src/engine/platform/vera.cpp b/src/engine/platform/vera.cpp
index 4dcc8f6c..65a7452e 100644
--- a/src/engine/platform/vera.cpp
+++ b/src/engine/platform/vera.cpp
@@ -151,16 +151,16 @@ int DivPlatformVERA::calcNoteFreq(int ch, int note) {
   if (ch<16) {
     return parent->calcBaseFreq(chipClock,2097152,note,false);
   } else {
-    double off=1.0;
+    double off=65536.0;
     if (chan[ch].pcm.sample>=0 && chan[ch].pcm.sample<parent->song.sampleLen) {
       DivSample* s=parent->getSample(chan[ch].pcm.sample);
       if (s->centerRate<1) {
-        off=1.0;
+        off=65536.0;
       } else {
-        off=s->centerRate/8363.0;
+        off=65536.0*(s->centerRate/8363.0);
       }
     }
-    return (int)(off*parent->calcBaseFreq(chipClock,65536,note,false));
+    return (int)(parent->calcBaseFreq(chipClock,off,note,false));
   }
 }
 
@@ -208,7 +208,7 @@ void DivPlatformVERA::tick(bool sysTick) {
       chan[i].freqChanged=true;
     }
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8,chan[i].pitch2,chipClock,2097152);
       if (chan[i].freq>65535) chan[i].freq=65535;
       rWrite(i,0,chan[i].freq&0xff);
       rWrite(i,1,(chan[i].freq>>8)&0xff);
@@ -237,7 +237,16 @@ void DivPlatformVERA::tick(bool sysTick) {
     }
   }
   if (chan[16].freqChanged) {
-    chan[16].freq=parent->calcFreq(chan[16].baseFreq,chan[16].pitch,false,8,chan[16].pitch2);
+    double off=65536.0;
+    if (chan[16].pcm.sample>=0 && chan[16].pcm.sample<parent->song.sampleLen) {
+      DivSample* s=parent->getSample(chan[16].pcm.sample);
+      if (s->centerRate<1) {
+        off=65536.0;
+      } else {
+        off=65536.0*(s->centerRate/8363.0);
+      }
+    }
+    chan[16].freq=parent->calcFreq(chan[16].baseFreq,chan[16].pitch,false,8,chan[16].pitch2,chipClock,off);
     if (chan[16].freq>128) chan[16].freq=128;
     rWritePCMRate(chan[16].freq&0xff);
     chan[16].freqChanged=false;
@@ -248,8 +257,8 @@ int DivPlatformVERA::dispatch(DivCommand c) {
   int tmp;
   switch (c.cmd) {
     case DIV_CMD_NOTE_ON:
-      if(c.chan<16) {
-        rWriteLo(c.chan,2,chan[c.chan].vol)
+      if (c.chan<16) {
+        rWriteLo(c.chan,2,chan[c.chan].vol);
       } else {
         chan[16].pcm.sample=parent->getIns(chan[16].ins,DIV_INS_VERA)->amiga.initSample;
         if (chan[16].pcm.sample<0 || chan[16].pcm.sample>=parent->song.sampleLen) {
@@ -297,11 +306,15 @@ int DivPlatformVERA::dispatch(DivCommand c) {
       if (c.chan<16) {
         tmp=c.value&0x3f;
         chan[c.chan].vol=tmp;
-        rWriteLo(c.chan,2,tmp);
+        if (chan[c.chan].active) {
+          rWriteLo(c.chan,2,tmp);
+        }
       } else {
         tmp=c.value&0x0f;
         chan[c.chan].vol=tmp;
-        rWritePCMVol(tmp);
+        if (chan[c.chan].active) {
+          rWritePCMVol(tmp);
+        }
       }
       break;
     case DIV_CMD_GET_VOLUME:
@@ -401,7 +414,7 @@ void DivPlatformVERA::muteChannel(int ch, bool mute) {
 }
 
 float DivPlatformVERA::getPostAmp() {
-  return 8.0f;
+  return 4.0f;
 }
 
 bool DivPlatformVERA::isStereo() {
diff --git a/src/engine/platform/vic20.cpp b/src/engine/platform/vic20.cpp
index 33250bfc..1c8c1fe0 100644
--- a/src/engine/platform/vic20.cpp
+++ b/src/engine/platform/vic20.cpp
@@ -132,7 +132,7 @@ void DivPlatformVIC20::tick(bool sysTick) {
       chan[i].freqChanged=true;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
       if (i<3) {
         chan[i].freq>>=(2-i);
       } else {
diff --git a/src/engine/platform/vrc6.cpp b/src/engine/platform/vrc6.cpp
index 835acf4b..4e811794 100644
--- a/src/engine/platform/vrc6.cpp
+++ b/src/engine/platform/vrc6.cpp
@@ -197,9 +197,9 @@ void DivPlatformVRC6::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       if (i==2) { // sawtooth
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2)-1;
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,14)-1;
       } else { // pulse
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2)-1;
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,16)-1;
         if (chan[i].furnaceDac) {
           double off=1.0;
           if (chan[i].dacSample>=0 && chan[i].dacSample<parent->song.sampleLen) {
diff --git a/src/engine/platform/x1_010.cpp b/src/engine/platform/x1_010.cpp
index 03cd4f6b..f1711243 100644
--- a/src/engine/platform/x1_010.cpp
+++ b/src/engine/platform/x1_010.cpp
@@ -262,17 +262,17 @@ void DivPlatformX1_010::acquire(short* bufL, short* bufR, size_t start, size_t l
 
 double DivPlatformX1_010::NoteX1_010(int ch, int note) {
   if (chan[ch].pcm) { // PCM note
-    double off=1.0;
+    double off=8192.0;
     int sample=chan[ch].sample;
     if (sample>=0 && sample<parent->song.sampleLen) {
       DivSample* s=parent->getSample(sample);
       if (s->centerRate<1) {
-        off=1.0;
+        off=8192.0;
       } else {
-        off=s->centerRate/8363.0;
+        off=8192.0*(s->centerRate/8363.0);
       }
     }
-    return off*parent->calcBaseFreq(chipClock,8192,note,false);
+    return parent->calcBaseFreq(chipClock,off,note,false);
   }
   // Wavetable note
   return NOTE_FREQUENCY(note);
@@ -487,7 +487,19 @@ void DivPlatformX1_010::tick(bool sysTick) {
       chan[i].envChanged=false;
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2);
+      double off=8192.0;
+      if (chan[i].pcm) {
+        int sample=chan[i].sample;
+        if (sample>=0 && sample<parent->song.sampleLen) {
+          DivSample* s=parent->getSample(sample);
+          if (s->centerRate<1) {
+            off=8192.0;
+          } else {
+            off=8192.0*(s->centerRate/8363.0);
+          }
+        }
+      }
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,chan[i].pcm?off:CHIP_FREQBASE);
       if (chan[i].pcm) {
         if (chan[i].freq<1) chan[i].freq=1;
         if (chan[i].freq>255) chan[i].freq=255;
diff --git a/src/engine/platform/ym2203.cpp b/src/engine/platform/ym2203.cpp
new file mode 100644
index 00000000..83233e8f
--- /dev/null
+++ b/src/engine/platform/ym2203.cpp
@@ -0,0 +1,1127 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "ym2203.h"
+#include "sound/ymfm/ymfm.h"
+#include "../engine.h"
+#include <string.h>
+#include <math.h>
+
+#include "ym2203shared.h"
+
+#include "fmshared_OPN.h"
+
+static unsigned char konOffs[3]={
+  0, 1, 2
+};
+
+#define CHIP_DIVIDER 32
+
+const char* regCheatSheetYM2203[]={
+  // SSG
+  "SSG_FreqL_A",     "000",
+  "SSG_FreqH_A",     "001",
+  "SSG_FreqL_B",     "002",
+  "SSG_FreqH_B",     "003",
+  "SSG_FreqL_C",     "004",
+  "SSG_FreqH_C",     "005",
+  "SSG_FreqNoise",   "006",
+  "SSG_Enable",      "007",
+  "SSG_Volume_A",    "008",
+  "SSG_Volume_B",    "009",
+  "SSG_Volume_C",    "00A",
+  "SSG_FreqL_Env",   "00B",
+  "SSG_FreqH_Env",   "00C",
+  "SSG_Control_Env", "00D",
+  // FM (Common)
+  "FM_Test",         "021",
+  "FM_LFOFreq",      "022",
+  "ClockA1",         "024",
+  "ClockA2",         "025",
+  "ClockB",          "026",
+  "FM_Control",      "027",
+  "FM_NoteCtl",      "028",
+  // FM (Channel 1-3)
+  "FM1_Op1_DT_MULT", "030",
+  "FM2_Op1_DT_MULT", "031",
+  "FM3_Op1_DT_MULT", "032",
+  "FM1_Op2_DT_MULT", "034",
+  "FM2_Op2_DT_MULT", "035",
+  "FM3_Op2_DT_MULT", "036",
+  "FM1_Op3_DT_MULT", "038",
+  "FM2_Op3_DT_MULT", "039",
+  "FM3_Op3_DT_MULT", "03A",
+  "FM1_Op4_DT_MULT", "03C",
+  "FM2_Op4_DT_MULT", "03D",
+  "FM3_Op4_DT_MULT", "03E",
+  "FM1_Op1_TL",      "040",
+  "FM2_Op1_TL",      "041",
+  "FM3_Op1_TL",      "042",
+  "FM1_Op2_TL",      "044",
+  "FM2_Op2_TL",      "045",
+  "FM3_Op2_TL",      "046",
+  "FM1_Op3_TL",      "048",
+  "FM2_Op3_TL",      "049",
+  "FM3_Op3_TL",      "04A",
+  "FM1_Op4_TL",      "04C",
+  "FM2_Op4_TL",      "04D",
+  "FM3_Op4_TL",      "04E",
+  "FM1_Op1_KS_AR",   "050",
+  "FM2_Op1_KS_AR",   "051",
+  "FM3_Op1_KS_AR",   "052",
+  "FM1_Op2_KS_AR",   "054",
+  "FM2_Op2_KS_AR",   "055",
+  "FM3_Op2_KS_AR",   "056",
+  "FM1_Op3_KS_AR",   "058",
+  "FM2_Op3_KS_AR",   "059",
+  "FM3_Op3_KS_AR",   "05A",
+  "FM1_Op4_KS_AR",   "05C",
+  "FM2_Op4_KS_AR",   "05D",
+  "FM3_Op4_KS_AR",   "05E",
+  "FM1_Op1_AM_DR",   "060",
+  "FM2_Op1_AM_DR",   "061",
+  "FM3_Op1_AM_DR",   "062",
+  "FM1_Op2_AM_DR",   "064",
+  "FM2_Op2_AM_DR",   "065",
+  "FM3_Op2_AM_DR",   "066",
+  "FM1_Op3_AM_DR",   "068",
+  "FM2_Op3_AM_DR",   "069",
+  "FM3_Op3_AM_DR",   "06A",
+  "FM1_Op4_AM_DR",   "06C",
+  "FM2_Op4_AM_DR",   "06D",
+  "FM3_Op4_AM_DR",   "06E",
+  "FM1_Op1_SR",      "070",
+  "FM2_Op1_SR",      "071",
+  "FM3_Op1_SR",      "072",
+  "FM1_Op2_SR",      "074",
+  "FM2_Op2_SR",      "075",
+  "FM3_Op2_SR",      "076",
+  "FM1_Op3_SR",      "078",
+  "FM2_Op3_SR",      "079",
+  "FM3_Op3_SR",      "07A",
+  "FM1_Op4_SR",      "07C",
+  "FM2_Op4_SR",      "07D",
+  "FM3_Op4_SR",      "07E",
+  "FM1_Op1_SL_RR",   "080",
+  "FM2_Op1_SL_RR",   "081",
+  "FM3_Op1_SL_RR",   "082",
+  "FM1_Op2_SL_RR",   "084",
+  "FM2_Op2_SL_RR",   "085",
+  "FM3_Op2_SL_RR",   "086",
+  "FM1_Op3_SL_RR",   "088",
+  "FM2_Op3_SL_RR",   "089",
+  "FM3_Op3_SL_RR",   "08A",
+  "FM1_Op4_SL_RR",   "08C",
+  "FM2_Op4_SL_RR",   "08D",
+  "FM3_Op4_SL_RR",   "08E",
+  "FM1_Op1_SSG_EG",  "090",
+  "FM2_Op1_SSG_EG",  "091",
+  "FM3_Op1_SSG_EG",  "092",
+  "FM1_Op2_SSG_EG",  "094",
+  "FM2_Op2_SSG_EG",  "095",
+  "FM3_Op2_SSG_EG",  "096",
+  "FM1_Op3_SSG_EG",  "098",
+  "FM2_Op3_SSG_EG",  "099",
+  "FM3_Op3_SSG_EG",  "09A",
+  "FM1_Op4_SSG_EG",  "09C",
+  "FM2_Op4_SSG_EG",  "09D",
+  "FM3_Op4_SSG_EG",  "09E",
+  "FM1_FNum1",       "0A0",
+  "FM2_FNum1",       "0A1",
+  "FM3_(Op1)FNum1",  "0A2",
+  "FM1_FNum2",       "0A4",
+  "FM2_FNum2",       "0A5",
+  "FM3_(Op1)FNum2",  "0A6",
+  "FM3_Op2_FNum1",   "0A8",
+  "FM3_Op3_FNum1",   "0A9",
+  "FM3_Op4_FNum1",   "0AA",
+  "FM3_Op2_FNum2",   "0AC",
+  "FM3_Op3_FNum2",   "0AD",
+  "FM3_Op4_FNum2",   "0AE",
+  "FM1_FB_ALG",      "0B0",
+  "FM2_FB_ALG",      "0B1",
+  "FM3_FB_ALG",      "0B2",
+  "FM1_Pan_LFO",     "0B4",
+  "FM2_Pan_LFO",     "0B5",
+  "FM3_Pan_LFO",     "0B6",
+  NULL
+};
+
+const char** DivPlatformYM2203::getRegisterSheet() {
+  return regCheatSheetYM2203;
+}
+
+const char* DivPlatformYM2203::getEffectName(unsigned char effect) {
+  switch (effect) {
+    case 0x10:
+      return "10xy: Setup LFO (x: enable; y: speed)";
+      break;
+    case 0x11:
+      return "11xx: Set feedback (0 to 7)";
+      break;
+    case 0x12:
+      return "12xx: Set level of operator 1 (0 highest, 7F lowest)";
+      break;
+    case 0x13:
+      return "13xx: Set level of operator 2 (0 highest, 7F lowest)";
+      break;
+    case 0x14:
+      return "14xx: Set level of operator 3 (0 highest, 7F lowest)";
+      break;
+    case 0x15:
+      return "15xx: Set level of operator 4 (0 highest, 7F lowest)";
+      break;
+    case 0x16:
+      return "16xy: Set operator multiplier (x: operator from 1 to 4; y: multiplier)";
+      break;
+    case 0x18:
+      return "18xx: Toggle extended channel 3 mode";
+      break;
+    case 0x19:
+      return "19xx: Set attack of all operators (0 to 1F)";
+      break;
+    case 0x1a:
+      return "1Axx: Set attack of operator 1 (0 to 1F)";
+      break;
+    case 0x1b:
+      return "1Bxx: Set attack of operator 2 (0 to 1F)";
+      break;
+    case 0x1c:
+      return "1Cxx: Set attack of operator 3 (0 to 1F)";
+      break;
+    case 0x1d:
+      return "1Dxx: Set attack of operator 4 (0 to 1F)";
+      break;
+    case 0x20:
+      return "20xx: Set SSG channel mode (bit 0: square; bit 1: noise; bit 2: envelope)";
+      break;
+    case 0x21:
+      return "21xx: Set SSG noise frequency (0 to 1F)";
+      break;
+    case 0x22:
+      return "22xy: Set SSG envelope mode (x: shape, y: enable for this channel)";
+      break;
+    case 0x23:
+      return "23xx: Set SSG envelope period low byte";
+      break;
+    case 0x24:
+      return "24xx: Set SSG envelope period high byte";
+      break;
+    case 0x25:
+      return "25xx: SSG envelope slide up";
+      break;
+    case 0x26:
+      return "26xx: SSG envelope slide down";
+      break;
+    case 0x29:
+      return "29xy: Set SSG auto-envelope (x: numerator; y: denominator)";
+      break;
+    case 0x30:
+      return "30xx: Toggle hard envelope reset on new notes";
+      break;
+    case 0x50:
+      return "50xy: Set AM (x: operator from 1 to 4 (0 for all ops); y: AM)";
+      break;
+    case 0x51:
+      return "51xy: Set sustain level (x: operator from 1 to 4 (0 for all ops); y: sustain)";
+      break;
+    case 0x52:
+      return "52xy: Set release (x: operator from 1 to 4 (0 for all ops); y: release)";
+      break;
+    case 0x53:
+      return "53xy: Set detune (x: operator from 1 to 4 (0 for all ops); y: detune where 3 is center)";
+      break;
+    case 0x54:
+      return "54xy: Set envelope scale (x: operator from 1 to 4 (0 for all ops); y: scale from 0 to 3)";
+      break;
+    case 0x55:
+      return "55xy: Set SSG envelope (x: operator from 1 to 4 (0 for all ops); y: 0-7 on, 8 off)";
+      break;
+    case 0x56:
+      return "56xx: Set decay of all operators (0 to 1F)";
+      break;
+    case 0x57:
+      return "57xx: Set decay of operator 1 (0 to 1F)";
+      break;
+    case 0x58:
+      return "58xx: Set decay of operator 2 (0 to 1F)";
+      break;
+    case 0x59:
+      return "59xx: Set decay of operator 3 (0 to 1F)";
+      break;
+    case 0x5a:
+      return "5Axx: Set decay of operator 4 (0 to 1F)";
+      break;
+    case 0x5b:
+      return "5Bxx: Set decay 2 of all operators (0 to 1F)";
+      break;
+    case 0x5c:
+      return "5Cxx: Set decay 2 of operator 1 (0 to 1F)";
+      break;
+    case 0x5d:
+      return "5Dxx: Set decay 2 of operator 2 (0 to 1F)";
+      break;
+    case 0x5e:
+      return "5Exx: Set decay 2 of operator 3 (0 to 1F)";
+      break;
+    case 0x5f:
+      return "5Fxx: Set decay 2 of operator 4 (0 to 1F)";
+      break;
+  }
+  return NULL;
+}
+
+void DivPlatformYM2203::acquire(short* bufL, short* bufR, size_t start, size_t len) {
+  static int os;
+
+  /*ymfm::ym2612::fm_engine* fme=fm->debug_fm_engine();
+  ymfm::ssg_engine* ssge=fm->debug_ssg_engine();
+  ymfm::adpcm_a_engine* aae=fm->debug_adpcm_a_engine();
+  ymfm::adpcm_b_engine* abe=fm->debug_adpcm_b_engine();
+
+  ymfm::ssg_engine::output_data ssgOut;
+
+  ymfm::fm_channel<ymfm::opn_registers_base<true>>* fmChan[6];
+  ymfm::adpcm_a_channel* adpcmAChan[6];
+  for (int i=0; i<6; i++) {
+    fmChan[i]=fme->debug_channel(i);
+    adpcmAChan[i]=aae->debug_channel(i);
+  }*/
+
+  for (size_t h=start; h<start+len; h++) {
+    os=0;
+    if (!writes.empty()) {
+      if (--delay<1) {
+        QueuedWrite& w=writes.front();
+        fm->write(0x0,w.addr);
+        fm->write(0x1,w.val);
+        regPool[w.addr&0xff]=w.val;
+        writes.pop();
+        delay=16;
+      }
+    }
+    
+    fm->generate(&fmout);
+
+    os=fmout.data[0]+((fmout.data[1]+fmout.data[2]+fmout.data[3])>>1);
+    if (os<-32768) os=-32768;
+    if (os>32767) os=32767;
+  
+    bufL[h]=os;
+
+    /*
+    for (int i=0; i<6; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=(fmChan[i]->debug_output(0)+fmChan[i]->debug_output(1));
+    }
+
+    ssge->get_last_out(ssgOut);
+    for (int i=6; i<9; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=ssgOut.data[i-6];
+    }
+
+    for (int i=9; i<15; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=adpcmAChan[i-9]->get_last_out(0)+adpcmAChan[i-9]->get_last_out(1);
+    }
+
+    oscBuf[15]->data[oscBuf[15]->needle++]=abe->get_last_out(0)+abe->get_last_out(1);
+    */
+  }
+}
+
+void DivPlatformYM2203::tick(bool sysTick) {
+  // PSG
+  ay->tick(sysTick);
+  ay->flushWrites();
+  for (DivRegWrite& i: ay->getRegisterWrites()) {
+    immWrite(i.addr&15,i.val);
+  }
+  ay->getRegisterWrites().clear();
+  
+  // FM
+  for (int i=0; i<3; i++) {
+    if (i==2 && extMode) continue;
+    chan[i].std.next();
+
+    if (chan[i].std.vol.had) {
+      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      for (int j=0; j<4; j++) {
+        unsigned short baseAddr=chanOffs[i]|opOffs[j];
+        DivInstrumentFM::Operator& op=chan[i].state.op[j];
+        if (isOutput[chan[i].state.alg][j]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+    }
+
+    if (chan[i].std.arp.had) {
+      if (!chan[i].inPorta) {
+        if (chan[i].std.arp.mode) {
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].std.arp.val,11);
+        } else {
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note+(signed char)chan[i].std.arp.val,11);
+        }
+      }
+      chan[i].freqChanged=true;
+    } else {
+      if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
+        chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note,11);
+        chan[i].freqChanged=true;
+      }
+    }
+
+    if (chan[i].std.panL.had) {
+      chan[i].pan=chan[i].std.panL.val&3;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+
+    if (chan[i].std.pitch.had) {
+      if (chan[i].std.pitch.mode) {
+        chan[i].pitch2+=chan[i].std.pitch.val;
+        CLAMP_VAR(chan[i].pitch2,-2048,2048);
+      } else {
+        chan[i].pitch2=chan[i].std.pitch.val;
+      }
+      chan[i].freqChanged=true;
+    }
+
+    if (chan[i].std.phaseReset.had) {
+      if (chan[i].std.phaseReset.val==1) {
+        chan[i].keyOn=true;
+      }
+    }
+
+    if (chan[i].std.alg.had) {
+      chan[i].state.alg=chan[i].std.alg.val;
+      rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+      if (!parent->song.algMacroBehavior) for (int j=0; j<4; j++) {
+        unsigned short baseAddr=chanOffs[i]|opOffs[j];
+        DivInstrumentFM::Operator& op=chan[i].state.op[j];
+        if (isMuted[i]) {
+          rWrite(baseAddr+ADDR_TL,127);
+        } else {
+          if (isOutput[chan[i].state.alg][j]) {
+            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          } else {
+            rWrite(baseAddr+ADDR_TL,op.tl);
+          }
+        }
+      }
+    }
+    if (chan[i].std.fb.had) {
+      chan[i].state.fb=chan[i].std.fb.val;
+      rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+    }
+    if (chan[i].std.fms.had) {
+      chan[i].state.fms=chan[i].std.fms.val;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+    if (chan[i].std.ams.had) {
+      chan[i].state.ams=chan[i].std.ams.val;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+    for (int j=0; j<4; j++) {
+      unsigned short baseAddr=chanOffs[i]|opOffs[j];
+      DivInstrumentFM::Operator& op=chan[i].state.op[j];
+      DivMacroInt::IntOp& m=chan[i].std.op[j];
+      if (m.am.had) {
+        op.am=m.am.val;
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      if (m.ar.had) {
+        op.ar=m.ar.val;
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      if (m.dr.had) {
+        op.dr=m.dr.val;
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      if (m.mult.had) {
+        op.mult=m.mult.val;
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      if (m.rr.had) {
+        op.rr=m.rr.val;
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      if (m.sl.had) {
+        op.sl=m.sl.val;
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      if (m.tl.had) {
+        op.tl=127-m.tl.val;
+        if (isOutput[chan[i].state.alg][j]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+      if (m.rs.had) {
+        op.rs=m.rs.val;
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      if (m.dt.had) {
+        op.dt=m.dt.val;
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      if (m.d2r.had) {
+        op.d2r=m.d2r.val;
+        rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      }
+      if (m.ssg.had) {
+        op.ssgEnv=m.ssg.val;
+        rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+      }
+    }
+
+    if (chan[i].keyOn || chan[i].keyOff) {
+      if (chan[i].hardReset && chan[i].keyOn) {
+        for (int j=0; j<4; j++) {
+          unsigned short baseAddr=chanOffs[i]|opOffs[j];
+          immWrite(baseAddr+ADDR_SL_RR,0x0f);
+          immWrite(baseAddr+ADDR_TL,0x7f);
+          oldWrites[baseAddr+ADDR_SL_RR]=-1;
+          oldWrites[baseAddr+ADDR_TL]=-1;
+          //rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      }
+      immWrite(0x28,0x00|konOffs[i]);
+      if (chan[i].hardReset && chan[i].keyOn) {
+        for (int j=0; j<4; j++) {
+          unsigned short baseAddr=chanOffs[i]|opOffs[j];
+          for (int k=0; k<100; k++) {
+            immWrite(baseAddr+ADDR_SL_RR,0x0f);
+          }
+        }
+      }
+      chan[i].keyOff=false;
+    }
+  }
+
+  for (int i=16; i<256; i++) {
+    if (pendingWrites[i]!=oldWrites[i]) {
+      immWrite(i,pendingWrites[i]&0xff);
+      oldWrites[i]=pendingWrites[i];
+    }
+  }
+
+  for (int i=0; i<3; i++) {
+    if (i==2 && extMode) continue;
+    if (chan[i].freqChanged) {
+      if (parent->song.linearPitch==2) {
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2);
+        int block=(chan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        chan[i].freq=(block<<11)|fNum;
+      }
+      if (chan[i].freq>0x3fff) chan[i].freq=0x3fff;
+      immWrite(chanOffs[i]+ADDR_FREQH,chan[i].freq>>8);
+      immWrite(chanOffs[i]+ADDR_FREQ,chan[i].freq&0xff);
+      chan[i].freqChanged=false;
+    }
+    if (chan[i].keyOn) {
+      immWrite(0x28,0xf0|konOffs[i]);
+      chan[i].keyOn=false;
+    }
+  }
+}
+
+int DivPlatformYM2203::dispatch(DivCommand c) {
+  if (c.chan>2) {
+    c.chan-=3;
+    return ay->dispatch(c);
+  }
+  switch (c.cmd) {
+    case DIV_CMD_NOTE_ON: {
+      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_FM);
+      chan[c.chan].macroInit(ins);
+      if (c.chan<3) {
+        if (!chan[c.chan].std.vol.will) {
+          chan[c.chan].outVol=chan[c.chan].vol;
+        }
+      }
+
+      if (chan[c.chan].insChanged) {
+        chan[c.chan].state=ins->fm;
+      }
+      
+      for (int i=0; i<4; i++) {
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+        if (isOutput[chan[c.chan].state.alg][i]) {
+          if (!chan[c.chan].active || chan[c.chan].insChanged) {
+            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          }
+        } else {
+          if (chan[c.chan].insChanged) {
+            rWrite(baseAddr+ADDR_TL,op.tl);
+          }
+        }
+        if (chan[c.chan].insChanged) {
+          rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+          rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+          rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+        }
+      }
+      if (chan[c.chan].insChanged) {
+        rWrite(chanOffs[c.chan]+ADDR_FB_ALG,(chan[c.chan].state.alg&7)|(chan[c.chan].state.fb<<3));
+        rWrite(chanOffs[c.chan]+ADDR_LRAF,(isMuted[c.chan]?0:(chan[c.chan].pan<<6))|(chan[c.chan].state.fms&7)|((chan[c.chan].state.ams&3)<<4));
+      }
+      chan[c.chan].insChanged=false;
+
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
+        chan[c.chan].portaPause=false;
+        chan[c.chan].freqChanged=true;
+        chan[c.chan].note=c.value;
+      }
+      chan[c.chan].keyOn=true;
+      chan[c.chan].active=true;
+      break;
+    }
+    case DIV_CMD_NOTE_OFF:
+      chan[c.chan].keyOff=true;
+      chan[c.chan].keyOn=false;
+      chan[c.chan].active=false;
+      chan[c.chan].macroInit(NULL);
+      break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      chan[c.chan].keyOff=true;
+      chan[c.chan].keyOn=false;
+      chan[c.chan].active=false;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_VOLUME: {
+      chan[c.chan].vol=c.value;
+      if (!chan[c.chan].std.vol.has) {
+        chan[c.chan].outVol=c.value;
+      }
+      for (int i=0; i<4; i++) {
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+        if (isOutput[chan[c.chan].state.alg][i]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+      break;
+    }
+    case DIV_CMD_GET_VOLUME: {
+      return chan[c.chan].vol;
+      break;
+    }
+    case DIV_CMD_INSTRUMENT:
+      if (chan[c.chan].ins!=c.value || c.value2==1) {
+        chan[c.chan].insChanged=true;
+      }
+      chan[c.chan].ins=c.value;
+      break;
+    case DIV_CMD_PANNING: {
+      if (c.value==0 && c.value2==0) {
+        chan[c.chan].pan=3;
+      } else {
+        chan[c.chan].pan=(c.value2>0)|((c.value>0)<<1);
+      }
+      rWrite(chanOffs[c.chan]+ADDR_LRAF,(isMuted[c.chan]?0:(chan[c.chan].pan<<6))|(chan[c.chan].state.fms&7)|((chan[c.chan].state.ams&3)<<4));
+      break;
+    }
+    case DIV_CMD_PITCH: {
+      chan[c.chan].pitch=c.value;
+      chan[c.chan].freqChanged=true;
+      break;
+    }
+    case DIV_CMD_NOTE_PORTA: {
+      if (c.chan>2 || parent->song.linearPitch==2) { // PSG
+        int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
+        bool return2=false;
+        if (destFreq>chan[c.chan].baseFreq) {
+          chan[c.chan].baseFreq+=c.value;
+          if (chan[c.chan].baseFreq>=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          chan[c.chan].baseFreq-=c.value;
+          if (chan[c.chan].baseFreq<=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        chan[c.chan].freqChanged=true;
+        if (return2) {
+          chan[c.chan].inPorta=false;
+          return 2;
+        }
+        break;
+      }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
+      int newFreq;
+      bool return2=false;
+      if (chan[c.chan].portaPause) {
+        chan[c.chan].baseFreq=chan[c.chan].portaPauseFreq;
+      }
+      if (destFreq>chan[c.chan].baseFreq) {
+        newFreq=chan[c.chan].baseFreq+c.value;
+        if (newFreq>=destFreq) {
+          newFreq=destFreq;
+          return2=true;
+        }
+      } else {
+        newFreq=chan[c.chan].baseFreq-c.value;
+        if (newFreq<=destFreq) {
+          newFreq=destFreq;
+          return2=true;
+        }
+      }
+      // check for octave boundary
+      // what the heck!
+      if (!chan[c.chan].portaPause) {
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+      }
+      chan[c.chan].portaPause=false;
+      chan[c.chan].freqChanged=true;
+      chan[c.chan].baseFreq=newFreq;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
+      break;
+    }
+    case DIV_CMD_LEGATO: {
+      chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
+      chan[c.chan].freqChanged=true;
+      break;
+    }
+    case DIV_CMD_FM_LFO: {
+      rWrite(0x22,(c.value&7)|((c.value>>4)<<3));
+      break;
+    }
+    case DIV_CMD_FM_FB: {
+      if (c.chan>2) break;
+      chan[c.chan].state.fb=c.value&7;
+      rWrite(chanOffs[c.chan]+ADDR_FB_ALG,(chan[c.chan].state.alg&7)|(chan[c.chan].state.fb<<3));
+      break;
+    }
+    case DIV_CMD_FM_MULT: {
+      if (c.chan>2) break;
+      unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+      DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+      op.mult=c.value2&15;
+      rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      break;
+    }
+    case DIV_CMD_FM_TL: {
+      if (c.chan>2) break;
+      unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+      DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+      op.tl=c.value2;
+      if (isOutput[chan[c.chan].state.alg][c.value]) {
+        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+      } else {
+        rWrite(baseAddr+ADDR_TL,op.tl);
+      }
+      break;
+    }
+    case DIV_CMD_FM_AR: {
+      if (c.chan>2) break;
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.ar=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+        }
+      } else {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.ar=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      break;
+    }
+    case DIV_CMD_FM_RS: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.rs=c.value2&3;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.rs=c.value2&3;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      break;
+    }
+    case DIV_CMD_FM_AM: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.am=c.value2&1;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.am=c.value2&1;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      break;
+    }
+    case DIV_CMD_FM_DR: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.dr=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.dr=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      break;
+    }
+    case DIV_CMD_FM_SL: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.sl=c.value2&15;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.sl=c.value2&15;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_RR: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.rr=c.value2&15;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.rr=c.value2&15;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_D2R: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.d2r=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.d2r=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      }
+      break;
+    }
+    case DIV_CMD_FM_DT: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.dt=c.value&7;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.dt=c.value2&7;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_SSG: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.ssgEnv=8^(c.value2&15);
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.ssgEnv=8^(c.value2&15);
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+      }
+      break;
+    }
+    case DIV_CMD_FM_HARD_RESET:
+      chan[c.chan].hardReset=c.value;
+      break;
+    case DIV_ALWAYS_SET_VOLUME:
+      return 0;
+      break;
+    case DIV_CMD_GET_VOLMAX:
+      if (c.chan>2) return 15;
+      return 127;
+      break;
+    case DIV_CMD_PRE_PORTA:
+      if (c.chan>2) {
+        if (chan[c.chan].active && c.value2) {
+          if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_FM));
+        }
+      }
+      chan[c.chan].inPorta=c.value;
+      break;
+    case DIV_CMD_PRE_NOTE:
+      break;
+    default:
+      //printf("WARNING: unimplemented command %d\n",c.cmd);
+      break;
+  }
+  return 1;
+}
+
+void DivPlatformYM2203::muteChannel(int ch, bool mute) {
+  isMuted[ch]=mute;
+  if (ch>2) { // PSG
+    ay->muteChannel(ch-3,mute);
+    return;
+  }
+  // FM
+  rWrite(chanOffs[ch]+ADDR_LRAF,(isMuted[ch]?0:(chan[ch].pan<<6))|(chan[ch].state.fms&7)|((chan[ch].state.ams&3)<<4));
+}
+
+void DivPlatformYM2203::forceIns() {
+  for (int i=0; i<3; i++) {
+    for (int j=0; j<4; j++) {
+      unsigned short baseAddr=chanOffs[i]|opOffs[j];
+      DivInstrumentFM::Operator& op=chan[i].state.op[j];
+      if (isOutput[chan[i].state.alg][j]) {
+        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+      } else {
+        rWrite(baseAddr+ADDR_TL,op.tl);
+      }
+      rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+    }
+    rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+    rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    if (chan[i].active) {
+      chan[i].keyOn=true;
+      chan[i].freqChanged=true;
+    }
+  }
+  for (int i=3; i<6; i++) {
+    chan[i].insChanged=true;
+  }
+
+  ay->forceIns();
+  ay->flushWrites();
+  for (DivRegWrite& i: ay->getRegisterWrites()) {
+    immWrite(i.addr&15,i.val);
+  }
+  ay->getRegisterWrites().clear();
+}
+
+void* DivPlatformYM2203::getChanState(int ch) {
+  return &chan[ch];
+}
+
+DivDispatchOscBuffer* DivPlatformYM2203::getOscBuffer(int ch) {
+  return oscBuf[ch];
+}
+
+unsigned char* DivPlatformYM2203::getRegisterPool() {
+  return regPool;
+}
+
+int DivPlatformYM2203::getRegisterPoolSize() {
+  return 256;
+}
+
+void DivPlatformYM2203::poke(unsigned int addr, unsigned short val) {
+  immWrite(addr,val);
+}
+
+void DivPlatformYM2203::poke(std::vector<DivRegWrite>& wlist) {
+  for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
+}
+
+void DivPlatformYM2203::reset() {
+  while (!writes.empty()) writes.pop();
+  memset(regPool,0,256);
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
+  fm->reset();
+  for (int i=0; i<6; i++) {
+    chan[i]=DivPlatformYM2203::Channel();
+    chan[i].std.setEngine(parent);
+  }
+  for (int i=0; i<3; i++) {
+    chan[i].vol=0x7f;
+    chan[i].outVol=0x7f;
+  }
+  for (int i=3; i<6; i++) {
+    chan[i].vol=0x0f;
+  }
+
+  for (int i=0; i<256; i++) {
+    oldWrites[i]=-1;
+    pendingWrites[i]=-1;
+  }
+
+  lastBusy=60;
+  sampleBank=0;
+
+  delay=0;
+
+  extMode=false;
+
+  // LFO
+  immWrite(0x22,0x08);
+
+  ay->reset();
+  ay->getRegisterWrites().clear();
+  ay->flushWrites();
+}
+
+bool DivPlatformYM2203::isStereo() {
+  return false;
+}
+
+bool DivPlatformYM2203::keyOffAffectsArp(int ch) {
+  return (ch>2);
+}
+
+void DivPlatformYM2203::notifyInsChange(int ins) {
+  for (int i=0; i<6; i++) {
+    if (chan[i].ins==ins) {
+      chan[i].insChanged=true;
+    }
+  }
+  ay->notifyInsChange(ins);
+}
+
+void DivPlatformYM2203::notifyInsDeletion(void* ins) {
+  ay->notifyInsDeletion(ins);
+}
+
+void DivPlatformYM2203::setSkipRegisterWrites(bool value) {
+  DivDispatch::setSkipRegisterWrites(value);
+  ay->setSkipRegisterWrites(value);
+}
+
+void DivPlatformYM2203::setFlags(unsigned int flags) {
+  unsigned char ayFlags=32;
+  if (flags==3) {
+    chipClock=3000000.0;
+    ayFlags=36;
+  } else if (flags==2) {
+    chipClock=4000000.0;
+    ayFlags=35;
+  } else if (flags==1) {
+    chipClock=COLOR_PAL*4.0/5.0;
+    ayFlags=33;
+  } else {
+    chipClock=COLOR_NTSC;
+    ayFlags=32;
+  }
+  ay->setFlags(ayFlags);
+  rate=fm->sample_rate(chipClock);
+  for (int i=0; i<6; i++) {
+    oscBuf[i]->rate=rate;
+  }
+}
+
+int DivPlatformYM2203::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
+  parent=p;
+  dumpWrites=false;
+  skipRegisterWrites=false;
+  for (int i=0; i<6; i++) {
+    isMuted[i]=false;
+    oscBuf[i]=new DivDispatchOscBuffer;
+  }
+  fm=new ymfm::ym2203(iface);
+  // YM2149, 2MHz
+  ay=new DivPlatformAY8910;
+  ay->init(p,3,sugRate,35);
+  ay->toggleRegisterDump(true);
+  setFlags(flags);
+
+  reset();
+  return 16;
+}
+
+void DivPlatformYM2203::quit() {
+  for (int i=0; i<6; i++) {
+    delete oscBuf[i];
+  }
+  ay->quit();
+  delete ay;
+  delete fm;
+}
+
+DivPlatformYM2203::~DivPlatformYM2203() {
+}
diff --git a/src/engine/platform/ym2203.h b/src/engine/platform/ym2203.h
new file mode 100644
index 00000000..1a6dad58
--- /dev/null
+++ b/src/engine/platform/ym2203.h
@@ -0,0 +1,134 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _YM2203_H
+#define _YM2203_H
+#include "../dispatch.h"
+#include "../macroInt.h"
+#include <queue>
+#include "sound/ymfm/ymfm_opn.h"
+
+#include "ay.h"
+
+class DivYM2203Interface: public ymfm::ymfm_interface {
+
+};
+
+class DivPlatformYM2203: public DivDispatch {
+  protected:
+    const unsigned short chanOffs[3]={
+      0x00, 0x01, 0x02
+    };
+
+    struct Channel {
+      DivInstrumentFM state;
+      unsigned char freqH, freqL;
+      int freq, baseFreq, pitch, pitch2, portaPauseFreq, note, ins;
+      unsigned char psgMode, autoEnvNum, autoEnvDen;
+      signed char konCycles;
+      bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta, furnacePCM, hardReset;
+      int vol, outVol;
+      int sample;
+      unsigned char pan;
+      DivMacroInt std;
+      void macroInit(DivInstrument* which) {
+        std.init(which);
+        pitch2=0;
+      }
+      Channel():
+        freqH(0),
+        freqL(0),
+        freq(0),
+        baseFreq(0),
+        pitch(0),
+        pitch2(0),
+        portaPauseFreq(0),
+        note(0),
+        ins(-1),
+        psgMode(1),
+        autoEnvNum(0),
+        autoEnvDen(0),
+        active(false),
+        insChanged(true),
+        freqChanged(false),
+        keyOn(false),
+        keyOff(false),
+        portaPause(false),
+        inPorta(false),
+        furnacePCM(false),
+        hardReset(false),
+        vol(0),
+        outVol(15),
+        sample(-1),
+        pan(3) {}
+    };
+    Channel chan[6];
+    DivDispatchOscBuffer* oscBuf[6];
+    bool isMuted[6];
+    struct QueuedWrite {
+      unsigned short addr;
+      unsigned char val;
+      bool addrOrVal;
+      QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
+    };
+    std::queue<QueuedWrite> writes;
+    ymfm::ym2203* fm;
+    ymfm::ym2203::output_data fmout;
+    DivYM2203Interface iface;
+    unsigned char regPool[512];
+    unsigned char lastBusy;
+  
+    DivPlatformAY8910* ay;
+    unsigned char sampleBank;
+
+    int delay;
+
+    bool extMode;
+  
+    short oldWrites[256];
+    short pendingWrites[256];
+
+    friend void putDispatchChan(void*,int,int);
+  
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    bool keyOffAffectsArp(int ch);
+    void notifyInsChange(int ins);
+    void notifyInsDeletion(void* ins);
+    void setSkipRegisterWrites(bool val);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    void setFlags(unsigned int flags);
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void quit();
+    ~DivPlatformYM2203();
+};
+#endif
diff --git a/src/engine/platform/ym2203shared.h b/src/engine/platform/ym2203shared.h
new file mode 100644
index 00000000..5aec7916
--- /dev/null
+++ b/src/engine/platform/ym2203shared.h
@@ -0,0 +1,45 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+static unsigned short opOffs[4]={
+  0x00, 0x04, 0x08, 0x0c
+};
+static bool isOutput[8][4]={
+  // 1     3     2    4
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,false,true},
+  {false,false,true ,true},
+  {false,true ,true ,true},
+  {false,true ,true ,true},
+  {true ,true ,true ,true},
+};
+static unsigned char dtTable[8]={
+  7,6,5,0,1,2,3,4
+};
+
+static int orderedOps[4]={
+  0,2,1,3
+};
+
+#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
+#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
+
+#define CHIP_FREQBASE 4720270
diff --git a/src/engine/platform/ym2608.cpp b/src/engine/platform/ym2608.cpp
new file mode 100644
index 00000000..3b3d5576
--- /dev/null
+++ b/src/engine/platform/ym2608.cpp
@@ -0,0 +1,1449 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "ym2608.h"
+#include "sound/ymfm/ymfm.h"
+#include "../engine.h"
+#include <string.h>
+#include <math.h>
+
+#include "ym2610shared.h"
+
+#include "fmshared_OPN.h"
+
+static unsigned char konOffs[6]={
+  0, 1, 2, 4, 5, 6
+};
+
+#define CHIP_DIVIDER 32
+
+const char* regCheatSheetYM2610B[]={
+  // SSG
+  "SSG_FreqL_A",     "000",
+  "SSG_FreqH_A",     "001",
+  "SSG_FreqL_B",     "002",
+  "SSG_FreqH_B",     "003",
+  "SSG_FreqL_C",     "004",
+  "SSG_FreqH_C",     "005",
+  "SSG_FreqNoise",   "006",
+  "SSG_Enable",      "007",
+  "SSG_Volume_A",    "008",
+  "SSG_Volume_B",    "009",
+  "SSG_Volume_C",    "00A",
+  "SSG_FreqL_Env",   "00B",
+  "SSG_FreqH_Env",   "00C",
+  "SSG_Control_Env", "00D",
+  // ADPCM-B
+  "ADPCMB_Control",  "010",
+  "ADPCMB_L_R",      "011",
+  "ADPCMB_StartL",   "012",
+  "ADPCMB_StartH",   "013",
+  "ADPCMB_EndL",     "014",
+  "ADPCMB_EndH",     "015",
+  "ADPCMB_FreqL",    "019",
+  "ADPCMB_FreqH",    "01A",
+  "ADPCMB_Volume",   "01B",
+  "ADPCM_Flag",      "01C",
+  // FM (Common)
+  "FM_Test",         "021",
+  "FM_LFOFreq",      "022",
+  "ClockA1",         "024",
+  "ClockA2",         "025",
+  "ClockB",          "026",
+  "FM_Control",      "027",
+  "FM_NoteCtl",      "028",
+  // FM (Channel 1-3)
+  "FM1_Op1_DT_MULT", "030",
+  "FM2_Op1_DT_MULT", "031",
+  "FM3_Op1_DT_MULT", "032",
+  "FM1_Op2_DT_MULT", "034",
+  "FM2_Op2_DT_MULT", "035",
+  "FM3_Op2_DT_MULT", "036",
+  "FM1_Op3_DT_MULT", "038",
+  "FM2_Op3_DT_MULT", "039",
+  "FM3_Op3_DT_MULT", "03A",
+  "FM1_Op4_DT_MULT", "03C",
+  "FM2_Op4_DT_MULT", "03D",
+  "FM3_Op4_DT_MULT", "03E",
+  "FM1_Op1_TL",      "040",
+  "FM2_Op1_TL",      "041",
+  "FM3_Op1_TL",      "042",
+  "FM1_Op2_TL",      "044",
+  "FM2_Op2_TL",      "045",
+  "FM3_Op2_TL",      "046",
+  "FM1_Op3_TL",      "048",
+  "FM2_Op3_TL",      "049",
+  "FM3_Op3_TL",      "04A",
+  "FM1_Op4_TL",      "04C",
+  "FM2_Op4_TL",      "04D",
+  "FM3_Op4_TL",      "04E",
+  "FM1_Op1_KS_AR",   "050",
+  "FM2_Op1_KS_AR",   "051",
+  "FM3_Op1_KS_AR",   "052",
+  "FM1_Op2_KS_AR",   "054",
+  "FM2_Op2_KS_AR",   "055",
+  "FM3_Op2_KS_AR",   "056",
+  "FM1_Op3_KS_AR",   "058",
+  "FM2_Op3_KS_AR",   "059",
+  "FM3_Op3_KS_AR",   "05A",
+  "FM1_Op4_KS_AR",   "05C",
+  "FM2_Op4_KS_AR",   "05D",
+  "FM3_Op4_KS_AR",   "05E",
+  "FM1_Op1_AM_DR",   "060",
+  "FM2_Op1_AM_DR",   "061",
+  "FM3_Op1_AM_DR",   "062",
+  "FM1_Op2_AM_DR",   "064",
+  "FM2_Op2_AM_DR",   "065",
+  "FM3_Op2_AM_DR",   "066",
+  "FM1_Op3_AM_DR",   "068",
+  "FM2_Op3_AM_DR",   "069",
+  "FM3_Op3_AM_DR",   "06A",
+  "FM1_Op4_AM_DR",   "06C",
+  "FM2_Op4_AM_DR",   "06D",
+  "FM3_Op4_AM_DR",   "06E",
+  "FM1_Op1_SR",      "070",
+  "FM2_Op1_SR",      "071",
+  "FM3_Op1_SR",      "072",
+  "FM1_Op2_SR",      "074",
+  "FM2_Op2_SR",      "075",
+  "FM3_Op2_SR",      "076",
+  "FM1_Op3_SR",      "078",
+  "FM2_Op3_SR",      "079",
+  "FM3_Op3_SR",      "07A",
+  "FM1_Op4_SR",      "07C",
+  "FM2_Op4_SR",      "07D",
+  "FM3_Op4_SR",      "07E",
+  "FM1_Op1_SL_RR",   "080",
+  "FM2_Op1_SL_RR",   "081",
+  "FM3_Op1_SL_RR",   "082",
+  "FM1_Op2_SL_RR",   "084",
+  "FM2_Op2_SL_RR",   "085",
+  "FM3_Op2_SL_RR",   "086",
+  "FM1_Op3_SL_RR",   "088",
+  "FM2_Op3_SL_RR",   "089",
+  "FM3_Op3_SL_RR",   "08A",
+  "FM1_Op4_SL_RR",   "08C",
+  "FM2_Op4_SL_RR",   "08D",
+  "FM3_Op4_SL_RR",   "08E",
+  "FM1_Op1_SSG_EG",  "090",
+  "FM2_Op1_SSG_EG",  "091",
+  "FM3_Op1_SSG_EG",  "092",
+  "FM1_Op2_SSG_EG",  "094",
+  "FM2_Op2_SSG_EG",  "095",
+  "FM3_Op2_SSG_EG",  "096",
+  "FM1_Op3_SSG_EG",  "098",
+  "FM2_Op3_SSG_EG",  "099",
+  "FM3_Op3_SSG_EG",  "09A",
+  "FM1_Op4_SSG_EG",  "09C",
+  "FM2_Op4_SSG_EG",  "09D",
+  "FM3_Op4_SSG_EG",  "09E",
+  "FM1_FNum1",       "0A0",
+  "FM2_FNum1",       "0A1",
+  "FM3_(Op1)FNum1",  "0A2",
+  "FM1_FNum2",       "0A4",
+  "FM2_FNum2",       "0A5",
+  "FM3_(Op1)FNum2",  "0A6",
+  "FM3_Op2_FNum1",   "0A8",
+  "FM3_Op3_FNum1",   "0A9",
+  "FM3_Op4_FNum1",   "0AA",
+  "FM3_Op2_FNum2",   "0AC",
+  "FM3_Op3_FNum2",   "0AD",
+  "FM3_Op4_FNum2",   "0AE",
+  "FM1_FB_ALG",      "0B0",
+  "FM2_FB_ALG",      "0B1",
+  "FM3_FB_ALG",      "0B2",
+  "FM1_Pan_LFO",     "0B4",
+  "FM2_Pan_LFO",     "0B5",
+  "FM3_Pan_LFO",     "0B6",
+  // ADPCM-A
+  "ADPCMA_Control",  "100",
+  "ADPCMA_MVol",     "101",
+  "ADPCMA_Test",     "102",
+  "ADPCMA_Ch1_Vol",  "108",
+  "ADPCMA_Ch2_Vol",  "109",
+  "ADPCMA_Ch3_Vol",  "10A",
+  "ADPCMA_Ch4_Vol",  "10B",
+  "ADPCMA_Ch5_Vol",  "10C",
+  "ADPCMA_Ch6_Vol",  "10D",
+  "ADPCMA_Ch1_StL",  "110",
+  "ADPCMA_Ch2_StL",  "111",
+  "ADPCMA_Ch3_StL",  "112",
+  "ADPCMA_Ch4_StL",  "113",
+  "ADPCMA_Ch5_StL",  "114",
+  "ADPCMA_Ch6_StL",  "115",
+  "ADPCMA_Ch1_StH",  "118",
+  "ADPCMA_Ch2_StH",  "119",
+  "ADPCMA_Ch3_StH",  "11A",
+  "ADPCMA_Ch4_StH",  "11B",
+  "ADPCMA_Ch5_StH",  "11C",
+  "ADPCMA_Ch6_StH",  "11D",
+  "ADPCMA_Ch1_EdL",  "120",
+  "ADPCMA_Ch2_EdL",  "121",
+  "ADPCMA_Ch3_EdL",  "122",
+  "ADPCMA_Ch4_EdL",  "123",
+  "ADPCMA_Ch5_EdL",  "124",
+  "ADPCMA_Ch6_EdL",  "125",
+  "ADPCMA_Ch1_EdH",  "128",
+  "ADPCMA_Ch2_EdH",  "129",
+  "ADPCMA_Ch3_EdH",  "12A",
+  "ADPCMA_Ch4_EdH",  "12B",
+  "ADPCMA_Ch5_EdH",  "12C",
+  "ADPCMA_Ch6_EdH",  "12D",
+  // FM (Channel 4-6)
+  "FM4_Op1_DT_MULT", "130",
+  "FM5_Op1_DT_MULT", "131",
+  "FM6_Op1_DT_MULT", "132",
+  "FM4_Op2_DT_MULT", "134",
+  "FM5_Op2_DT_MULT", "135",
+  "FM6_Op2_DT_MULT", "136",
+  "FM4_Op3_DT_MULT", "138",
+  "FM5_Op3_DT_MULT", "139",
+  "FM6_Op3_DT_MULT", "13A",
+  "FM4_Op4_DT_MULT", "13C",
+  "FM5_Op4_DT_MULT", "13D",
+  "FM6_Op4_DT_MULT", "13E",
+  "FM4_Op1_TL",      "140",
+  "FM5_Op1_TL",      "141",
+  "FM6_Op1_TL",      "142",
+  "FM4_Op2_TL",      "144",
+  "FM5_Op2_TL",      "145",
+  "FM6_Op2_TL",      "146",
+  "FM4_Op3_TL",      "148",
+  "FM5_Op3_TL",      "149",
+  "FM6_Op3_TL",      "14A",
+  "FM4_Op4_TL",      "14C",
+  "FM5_Op4_TL",      "14D",
+  "FM6_Op4_TL",      "14E",
+  "FM4_Op1_KS_AR",   "150",
+  "FM5_Op1_KS_AR",   "151",
+  "FM6_Op1_KS_AR",   "152",
+  "FM4_Op2_KS_AR",   "154",
+  "FM5_Op2_KS_AR",   "155",
+  "FM6_Op2_KS_AR",   "156",
+  "FM4_Op3_KS_AR",   "158",
+  "FM5_Op3_KS_AR",   "159",
+  "FM6_Op3_KS_AR",   "15A",
+  "FM4_Op4_KS_AR",   "15C",
+  "FM5_Op4_KS_AR",   "15D",
+  "FM6_Op4_KS_AR",   "15E",
+  "FM4_Op1_AM_DR",   "160",
+  "FM5_Op1_AM_DR",   "161",
+  "FM6_Op1_AM_DR",   "162",
+  "FM4_Op2_AM_DR",   "164",
+  "FM5_Op2_AM_DR",   "165",
+  "FM6_Op2_AM_DR",   "166",
+  "FM4_Op3_AM_DR",   "168",
+  "FM5_Op3_AM_DR",   "169",
+  "FM6_Op3_AM_DR",   "16A",
+  "FM4_Op4_AM_DR",   "16C",
+  "FM5_Op4_AM_DR",   "16D",
+  "FM6_Op4_AM_DR",   "16E",
+  "FM4_Op1_SR",      "170",
+  "FM5_Op1_SR",      "171",
+  "FM6_Op1_SR",      "172",
+  "FM4_Op2_SR",      "174",
+  "FM5_Op2_SR",      "175",
+  "FM6_Op2_SR",      "176",
+  "FM4_Op3_SR",      "178",
+  "FM5_Op3_SR",      "179",
+  "FM6_Op3_SR",      "17A",
+  "FM4_Op4_SR",      "17C",
+  "FM5_Op4_SR",      "17D",
+  "FM6_Op4_SR",      "17E",
+  "FM4_Op1_SL_RR",   "180",
+  "FM5_Op1_SL_RR",   "181",
+  "FM6_Op1_SL_RR",   "182",
+  "FM4_Op2_SL_RR",   "184",
+  "FM5_Op2_SL_RR",   "185",
+  "FM6_Op2_SL_RR",   "186",
+  "FM4_Op3_SL_RR",   "188",
+  "FM5_Op3_SL_RR",   "189",
+  "FM6_Op3_SL_RR",   "18A",
+  "FM4_Op4_SL_RR",   "18C",
+  "FM5_Op4_SL_RR",   "18D",
+  "FM6_Op4_SL_RR",   "18E",
+  "FM4_Op1_SSG_EG",  "190",
+  "FM5_Op1_SSG_EG",  "191",
+  "FM6_Op1_SSG_EG",  "192",
+  "FM4_Op2_SSG_EG",  "194",
+  "FM5_Op2_SSG_EG",  "195",
+  "FM6_Op2_SSG_EG",  "196",
+  "FM4_Op3_SSG_EG",  "198",
+  "FM5_Op3_SSG_EG",  "199",
+  "FM6_Op3_SSG_EG",  "19A",
+  "FM4_Op4_SSG_EG",  "19C",
+  "FM5_Op4_SSG_EG",  "19D",
+  "FM6_Op4_SSG_EG",  "19E",
+  "FM4_FNum1",       "1A0",
+  "FM5_FNum1",       "1A1",
+  "FM6_FNum1",       "1A2",
+  "FM4_FNum2",       "1A4",
+  "FM5_FNum2",       "1A5",
+  "FM6_FNum2",       "1A6",
+  "FM4_FB_ALG",      "1B0",
+  "FM5_FB_ALG",      "1B1",
+  "FM6_FB_ALG",      "1B2",
+  "FM4_Pan_LFO",     "1B4",
+  "FM5_Pan_LFO",     "1B5",
+  "FM6_Pan_LFO",     "1B6",
+  NULL
+};
+
+const char** DivPlatformYM2610B::getRegisterSheet() {
+  return regCheatSheetYM2610B;
+}
+
+const char* DivPlatformYM2610B::getEffectName(unsigned char effect) {
+  switch (effect) {
+    case 0x10:
+      return "10xy: Setup LFO (x: enable; y: speed)";
+      break;
+    case 0x11:
+      return "11xx: Set feedback (0 to 7)";
+      break;
+    case 0x12:
+      return "12xx: Set level of operator 1 (0 highest, 7F lowest)";
+      break;
+    case 0x13:
+      return "13xx: Set level of operator 2 (0 highest, 7F lowest)";
+      break;
+    case 0x14:
+      return "14xx: Set level of operator 3 (0 highest, 7F lowest)";
+      break;
+    case 0x15:
+      return "15xx: Set level of operator 4 (0 highest, 7F lowest)";
+      break;
+    case 0x16:
+      return "16xy: Set operator multiplier (x: operator from 1 to 4; y: multiplier)";
+      break;
+    case 0x18:
+      return "18xx: Toggle extended channel 3 mode";
+      break;
+    case 0x19:
+      return "19xx: Set attack of all operators (0 to 1F)";
+      break;
+    case 0x1a:
+      return "1Axx: Set attack of operator 1 (0 to 1F)";
+      break;
+    case 0x1b:
+      return "1Bxx: Set attack of operator 2 (0 to 1F)";
+      break;
+    case 0x1c:
+      return "1Cxx: Set attack of operator 3 (0 to 1F)";
+      break;
+    case 0x1d:
+      return "1Dxx: Set attack of operator 4 (0 to 1F)";
+      break;
+    case 0x20:
+      return "20xx: Set SSG channel mode (bit 0: square; bit 1: noise; bit 2: envelope)";
+      break;
+    case 0x21:
+      return "21xx: Set SSG noise frequency (0 to 1F)";
+      break;
+    case 0x22:
+      return "22xy: Set SSG envelope mode (x: shape, y: enable for this channel)";
+      break;
+    case 0x23:
+      return "23xx: Set SSG envelope period low byte";
+      break;
+    case 0x24:
+      return "24xx: Set SSG envelope period high byte";
+      break;
+    case 0x25:
+      return "25xx: SSG envelope slide up";
+      break;
+    case 0x26:
+      return "26xx: SSG envelope slide down";
+      break;
+    case 0x29:
+      return "29xy: Set SSG auto-envelope (x: numerator; y: denominator)";
+      break;
+    case 0x30:
+      return "30xx: Toggle hard envelope reset on new notes";
+      break;
+    case 0x50:
+      return "50xy: Set AM (x: operator from 1 to 4 (0 for all ops); y: AM)";
+      break;
+    case 0x51:
+      return "51xy: Set sustain level (x: operator from 1 to 4 (0 for all ops); y: sustain)";
+      break;
+    case 0x52:
+      return "52xy: Set release (x: operator from 1 to 4 (0 for all ops); y: release)";
+      break;
+    case 0x53:
+      return "53xy: Set detune (x: operator from 1 to 4 (0 for all ops); y: detune where 3 is center)";
+      break;
+    case 0x54:
+      return "54xy: Set envelope scale (x: operator from 1 to 4 (0 for all ops); y: scale from 0 to 3)";
+      break;
+    case 0x55:
+      return "55xy: Set SSG envelope (x: operator from 1 to 4 (0 for all ops); y: 0-7 on, 8 off)";
+      break;
+    case 0x56:
+      return "56xx: Set decay of all operators (0 to 1F)";
+      break;
+    case 0x57:
+      return "57xx: Set decay of operator 1 (0 to 1F)";
+      break;
+    case 0x58:
+      return "58xx: Set decay of operator 2 (0 to 1F)";
+      break;
+    case 0x59:
+      return "59xx: Set decay of operator 3 (0 to 1F)";
+      break;
+    case 0x5a:
+      return "5Axx: Set decay of operator 4 (0 to 1F)";
+      break;
+    case 0x5b:
+      return "5Bxx: Set decay 2 of all operators (0 to 1F)";
+      break;
+    case 0x5c:
+      return "5Cxx: Set decay 2 of operator 1 (0 to 1F)";
+      break;
+    case 0x5d:
+      return "5Dxx: Set decay 2 of operator 2 (0 to 1F)";
+      break;
+    case 0x5e:
+      return "5Exx: Set decay 2 of operator 3 (0 to 1F)";
+      break;
+    case 0x5f:
+      return "5Fxx: Set decay 2 of operator 4 (0 to 1F)";
+      break;
+  }
+  return NULL;
+}
+
+double DivPlatformYM2610B::NOTE_OPNB(int ch, int note) {
+  if (ch>8) { // ADPCM-B
+    return NOTE_ADPCMB(note);
+  } else if (ch>5) { // PSG
+    return NOTE_PERIODIC(note);
+  }
+  // FM
+  return NOTE_FNUM_BLOCK(note,11);
+}
+
+double DivPlatformYM2610B::NOTE_ADPCMB(int note) {
+  if (chan[15].sample>=0 && chan[15].sample<parent->song.sampleLen) {
+    double off=65535.0*(double)(parent->getSample(chan[15].sample)->centerRate)/8363.0;
+    return parent->calcBaseFreq((double)chipClock/144,off,note,false);
+  }
+  return 0;
+}
+
+void DivPlatformYM2610B::acquire(short* bufL, short* bufR, size_t start, size_t len) {
+  static int os[2];
+
+  ymfm::ym2612::fm_engine* fme=fm->debug_fm_engine();
+  ymfm::ssg_engine* ssge=fm->debug_ssg_engine();
+  ymfm::adpcm_a_engine* aae=fm->debug_adpcm_a_engine();
+  ymfm::adpcm_b_engine* abe=fm->debug_adpcm_b_engine();
+
+  ymfm::ssg_engine::output_data ssgOut;
+
+  ymfm::fm_channel<ymfm::opn_registers_base<true>>* fmChan[6];
+  ymfm::adpcm_a_channel* adpcmAChan[6];
+  for (int i=0; i<6; i++) {
+    fmChan[i]=fme->debug_channel(i);
+    adpcmAChan[i]=aae->debug_channel(i);
+  }
+
+  for (size_t h=start; h<start+len; h++) {
+    os[0]=0; os[1]=0;
+    if (!writes.empty()) {
+      if (--delay<1) {
+        QueuedWrite& w=writes.front();
+        fm->write(0x0+((w.addr>>8)<<1),w.addr);
+        fm->write(0x1+((w.addr>>8)<<1),w.val);
+        regPool[w.addr&0x1ff]=w.val;
+        writes.pop();
+        delay=4;
+      }
+    }
+    
+    fm->generate(&fmout);
+
+    os[0]=fmout.data[0]+(fmout.data[2]>>1);
+    if (os[0]<-32768) os[0]=-32768;
+    if (os[0]>32767) os[0]=32767;
+
+    os[1]=fmout.data[1]+(fmout.data[2]>>1);
+    if (os[1]<-32768) os[1]=-32768;
+    if (os[1]>32767) os[1]=32767;
+  
+    bufL[h]=os[0];
+    bufR[h]=os[1];
+
+    
+    for (int i=0; i<6; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=(fmChan[i]->debug_output(0)+fmChan[i]->debug_output(1));
+    }
+
+    ssge->get_last_out(ssgOut);
+    for (int i=6; i<9; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=ssgOut.data[i-6];
+    }
+
+    for (int i=9; i<15; i++) {
+      oscBuf[i]->data[oscBuf[i]->needle++]=adpcmAChan[i-9]->get_last_out(0)+adpcmAChan[i-9]->get_last_out(1);
+    }
+
+    oscBuf[15]->data[oscBuf[15]->needle++]=abe->get_last_out(0)+abe->get_last_out(1);
+  }
+}
+
+void DivPlatformYM2610B::tick(bool sysTick) {
+  // PSG
+  ay->tick(sysTick);
+  ay->flushWrites();
+  for (DivRegWrite& i: ay->getRegisterWrites()) {
+    immWrite(i.addr&15,i.val);
+  }
+  ay->getRegisterWrites().clear();
+  
+  // FM
+  for (int i=0; i<6; i++) {
+    if (i==2 && extMode) continue;
+    chan[i].std.next();
+
+    if (chan[i].std.vol.had) {
+      chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol.val))/127;
+      for (int j=0; j<4; j++) {
+        unsigned short baseAddr=chanOffs[i]|opOffs[j];
+        DivInstrumentFM::Operator& op=chan[i].state.op[j];
+        if (isOutput[chan[i].state.alg][j]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+    }
+
+    if (chan[i].std.arp.had) {
+      if (!chan[i].inPorta) {
+        if (chan[i].std.arp.mode) {
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].std.arp.val,11);
+        } else {
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note+(signed char)chan[i].std.arp.val,11);
+        }
+      }
+      chan[i].freqChanged=true;
+    } else {
+      if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
+        chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note,11);
+        chan[i].freqChanged=true;
+      }
+    }
+
+    if (chan[i].std.panL.had) {
+      chan[i].pan=chan[i].std.panL.val&3;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+
+    if (chan[i].std.pitch.had) {
+      if (chan[i].std.pitch.mode) {
+        chan[i].pitch2+=chan[i].std.pitch.val;
+        CLAMP_VAR(chan[i].pitch2,-2048,2048);
+      } else {
+        chan[i].pitch2=chan[i].std.pitch.val;
+      }
+      chan[i].freqChanged=true;
+    }
+
+    if (chan[i].std.phaseReset.had) {
+      if (chan[i].std.phaseReset.val==1) {
+        chan[i].keyOn=true;
+      }
+    }
+
+    if (chan[i].std.alg.had) {
+      chan[i].state.alg=chan[i].std.alg.val;
+      rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+      if (!parent->song.algMacroBehavior) for (int j=0; j<4; j++) {
+        unsigned short baseAddr=chanOffs[i]|opOffs[j];
+        DivInstrumentFM::Operator& op=chan[i].state.op[j];
+        if (isMuted[i]) {
+          rWrite(baseAddr+ADDR_TL,127);
+        } else {
+          if (isOutput[chan[i].state.alg][j]) {
+            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+          } else {
+            rWrite(baseAddr+ADDR_TL,op.tl);
+          }
+        }
+      }
+    }
+    if (chan[i].std.fb.had) {
+      chan[i].state.fb=chan[i].std.fb.val;
+      rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+    }
+    if (chan[i].std.fms.had) {
+      chan[i].state.fms=chan[i].std.fms.val;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+    if (chan[i].std.ams.had) {
+      chan[i].state.ams=chan[i].std.ams.val;
+      rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    }
+    for (int j=0; j<4; j++) {
+      unsigned short baseAddr=chanOffs[i]|opOffs[j];
+      DivInstrumentFM::Operator& op=chan[i].state.op[j];
+      DivMacroInt::IntOp& m=chan[i].std.op[j];
+      if (m.am.had) {
+        op.am=m.am.val;
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      if (m.ar.had) {
+        op.ar=m.ar.val;
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      if (m.dr.had) {
+        op.dr=m.dr.val;
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      if (m.mult.had) {
+        op.mult=m.mult.val;
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      if (m.rr.had) {
+        op.rr=m.rr.val;
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      if (m.sl.had) {
+        op.sl=m.sl.val;
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      if (m.tl.had) {
+        op.tl=127-m.tl.val;
+        if (isOutput[chan[i].state.alg][j]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+      if (m.rs.had) {
+        op.rs=m.rs.val;
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      if (m.dt.had) {
+        op.dt=m.dt.val;
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      if (m.d2r.had) {
+        op.d2r=m.d2r.val;
+        rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      }
+      if (m.ssg.had) {
+        op.ssgEnv=m.ssg.val;
+        rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+      }
+    }
+
+    if (chan[i].keyOn || chan[i].keyOff) {
+      if (chan[i].hardReset && chan[i].keyOn) {
+        for (int j=0; j<4; j++) {
+          unsigned short baseAddr=chanOffs[i]|opOffs[j];
+          immWrite(baseAddr+ADDR_SL_RR,0x0f);
+          immWrite(baseAddr+ADDR_TL,0x7f);
+          oldWrites[baseAddr+ADDR_SL_RR]=-1;
+          oldWrites[baseAddr+ADDR_TL]=-1;
+          //rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      }
+      immWrite(0x28,0x00|konOffs[i]);
+      if (chan[i].hardReset && chan[i].keyOn) {
+        for (int j=0; j<4; j++) {
+          unsigned short baseAddr=chanOffs[i]|opOffs[j];
+          for (int k=0; k<100; k++) {
+            immWrite(baseAddr+ADDR_SL_RR,0x0f);
+          }
+        }
+      }
+      chan[i].keyOff=false;
+    }
+  }
+  // ADPCM-B
+  if (chan[15].furnacePCM) {
+    chan[15].std.next();
+
+    if (chan[15].std.vol.had) {
+      chan[15].outVol=(chan[15].vol*MIN(64,chan[15].std.vol.val))/64;
+      immWrite(0x1b,chan[15].outVol);
+    }
+
+    if (chan[15].std.arp.had) {
+      if (!chan[15].inPorta) {
+        if (chan[15].std.arp.mode) {
+          chan[15].baseFreq=NOTE_ADPCMB(chan[15].std.arp.val);
+        } else {
+          chan[15].baseFreq=NOTE_ADPCMB(chan[15].note+(signed char)chan[15].std.arp.val);
+        }
+      }
+      chan[15].freqChanged=true;
+    } else {
+      if (chan[15].std.arp.mode && chan[15].std.arp.finished) {
+        chan[15].baseFreq=NOTE_ADPCMB(chan[15].note);
+        chan[15].freqChanged=true;
+      }
+    }
+  }
+  if (chan[15].freqChanged) {
+    if (chan[15].sample>=0 && chan[15].sample<parent->song.sampleLen) {
+      double off=65535.0*(double)(parent->getSample(chan[15].sample)->centerRate)/8363.0;
+      chan[15].freq=parent->calcFreq(chan[15].baseFreq,chan[15].pitch,false,4,chan[15].pitch2,(double)chipClock/144,off);
+    } else {
+      chan[15].freq=0;
+    }
+    immWrite(0x19,chan[15].freq&0xff);
+    immWrite(0x1a,(chan[15].freq>>8)&0xff);
+    chan[15].freqChanged=false;
+  }
+
+  for (int i=16; i<512; i++) {
+    if (pendingWrites[i]!=oldWrites[i]) {
+      immWrite(i,pendingWrites[i]&0xff);
+      oldWrites[i]=pendingWrites[i];
+    }
+  }
+
+  for (int i=0; i<6; i++) {
+    if (i==2 && extMode) continue;
+    if (chan[i].freqChanged) {
+      if (parent->song.linearPitch==2) {
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2);
+        int block=(chan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        chan[i].freq=(block<<11)|fNum;
+      }
+      if (chan[i].freq>0x3fff) chan[i].freq=0x3fff;
+      immWrite(chanOffs[i]+ADDR_FREQH,chan[i].freq>>8);
+      immWrite(chanOffs[i]+ADDR_FREQ,chan[i].freq&0xff);
+      chan[i].freqChanged=false;
+    }
+    if (chan[i].keyOn) {
+      immWrite(0x28,0xf0|konOffs[i]);
+      chan[i].keyOn=false;
+    }
+  }
+}
+
+int DivPlatformYM2610B::dispatch(DivCommand c) {
+  if (c.chan>5 && c.chan<9) {
+    c.chan-=6;
+    return ay->dispatch(c);
+  }
+  switch (c.cmd) {
+    case DIV_CMD_NOTE_ON: {
+      if (c.chan>14) { // ADPCM-B
+        DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_FM);
+        if (ins->type==DIV_INS_AMIGA) {
+          chan[c.chan].furnacePCM=true;
+        } else {
+          chan[c.chan].furnacePCM=false;
+        }
+        if (skipRegisterWrites) break;
+        if (chan[c.chan].furnacePCM) {
+          chan[c.chan].macroInit(ins);
+          if (!chan[c.chan].std.vol.will) {
+            chan[c.chan].outVol=chan[c.chan].vol;
+            immWrite(0x1b,chan[c.chan].outVol);
+          }
+          chan[c.chan].sample=ins->amiga.initSample;
+          if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
+            DivSample* s=parent->getSample(chan[c.chan].sample);
+            immWrite(0x12,(s->offB>>8)&0xff);
+            immWrite(0x13,s->offB>>16);
+            int end=s->offB+s->lengthB-1;
+            immWrite(0x14,(end>>8)&0xff);
+            immWrite(0x15,end>>16);
+            immWrite(0x11,isMuted[c.chan]?0:(chan[c.chan].pan<<6));
+            immWrite(0x10,(s->loopStart>=0)?0x90:0x80); // start/repeat
+            if (c.value!=DIV_NOTE_NULL) {
+              chan[c.chan].note=c.value;
+              chan[c.chan].baseFreq=NOTE_ADPCMB(chan[c.chan].note);
+              chan[c.chan].freqChanged=true;
+            }
+            chan[c.chan].active=true;
+            chan[c.chan].keyOn=true;
+          } else {
+            immWrite(0x10,0x01); // reset
+            immWrite(0x12,0);
+            immWrite(0x13,0);
+            immWrite(0x14,0);
+            immWrite(0x15,0);
+            break;
+          }
+        } else {
+          chan[c.chan].sample=-1;
+          chan[c.chan].macroInit(NULL);
+          chan[c.chan].outVol=chan[c.chan].vol;
+          if ((12*sampleBank+c.value%12)>=parent->song.sampleLen) {
+            immWrite(0x10,0x01); // reset
+            immWrite(0x12,0);
+            immWrite(0x13,0);
+            immWrite(0x14,0);
+            immWrite(0x15,0);
+            break;
+          }
+          DivSample* s=parent->getSample(12*sampleBank+c.value%12);
+          immWrite(0x12,(s->offB>>8)&0xff);
+          immWrite(0x13,s->offB>>16);
+          int end=s->offB+s->lengthB-1;
+          immWrite(0x14,(end>>8)&0xff);
+          immWrite(0x15,end>>16);
+          immWrite(0x11,isMuted[c.chan]?0:(chan[c.chan].pan<<6));
+          immWrite(0x10,(s->loopStart>=0)?0x90:0x80); // start/repeat
+          chan[c.chan].baseFreq=(((unsigned int)s->rate)<<16)/(chipClock/144);
+          chan[c.chan].freqChanged=true;
+        }
+        break;
+      }
+      if (c.chan>8) { // ADPCM-A
+        if (skipRegisterWrites) break;
+        if ((12*sampleBank+c.value%12)>=parent->song.sampleLen) {
+          immWrite(0x100,0x80|(1<<(c.chan-9)));
+          immWrite(0x110+c.chan-9,0);
+          immWrite(0x118+c.chan-9,0);
+          immWrite(0x120+c.chan-9,0);
+          immWrite(0x128+c.chan-9,0);
+          break;
+        }
+        DivSample* s=parent->getSample(12*sampleBank+c.value%12);
+        immWrite(0x110+c.chan-9,(s->offA>>8)&0xff);
+        immWrite(0x118+c.chan-9,s->offA>>16);
+        int end=s->offA+s->lengthA-1;
+        immWrite(0x120+c.chan-9,(end>>8)&0xff);
+        immWrite(0x128+c.chan-9,end>>16);
+        immWrite(0x108+(c.chan-9),isMuted[c.chan]?0:((chan[c.chan].pan<<6)|chan[c.chan].vol));
+        immWrite(0x100,0x00|(1<<(c.chan-9)));
+        break;
+      }
+      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_FM);
+      chan[c.chan].macroInit(ins);
+      if (c.chan<6) {
+        if (!chan[c.chan].std.vol.will) {
+          chan[c.chan].outVol=chan[c.chan].vol;
+        }
+      }
+
+      if (chan[c.chan].insChanged) {
+        chan[c.chan].state=ins->fm;
+      }
+      
+      for (int i=0; i<4; i++) {
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+        if (isOutput[chan[c.chan].state.alg][i]) {
+          if (!chan[c.chan].active || chan[c.chan].insChanged) {
+            rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+          }
+        } else {
+          if (chan[c.chan].insChanged) {
+            rWrite(baseAddr+ADDR_TL,op.tl);
+          }
+        }
+        if (chan[c.chan].insChanged) {
+          rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+          rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+          rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+        }
+      }
+      if (chan[c.chan].insChanged) {
+        rWrite(chanOffs[c.chan]+ADDR_FB_ALG,(chan[c.chan].state.alg&7)|(chan[c.chan].state.fb<<3));
+        rWrite(chanOffs[c.chan]+ADDR_LRAF,(isMuted[c.chan]?0:(chan[c.chan].pan<<6))|(chan[c.chan].state.fms&7)|((chan[c.chan].state.ams&3)<<4));
+      }
+      chan[c.chan].insChanged=false;
+
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
+        chan[c.chan].portaPause=false;
+        chan[c.chan].freqChanged=true;
+        chan[c.chan].note=c.value;
+      }
+      chan[c.chan].keyOn=true;
+      chan[c.chan].active=true;
+      break;
+    }
+    case DIV_CMD_NOTE_OFF:
+      if (c.chan>14) {
+        immWrite(0x10,0x01); // reset
+        break;
+      }
+      if (c.chan>8) {
+        immWrite(0x100,0x80|(1<<(c.chan-9)));
+        break;
+      }
+      chan[c.chan].keyOff=true;
+      chan[c.chan].keyOn=false;
+      chan[c.chan].active=false;
+      chan[c.chan].macroInit(NULL);
+      break;
+    case DIV_CMD_NOTE_OFF_ENV:
+      if (c.chan>14) {
+        immWrite(0x10,0x01); // reset
+        break;
+      }
+      if (c.chan>8) {
+        immWrite(0x100,0x80|(1<<(c.chan-9)));
+        break;
+      }
+      chan[c.chan].keyOff=true;
+      chan[c.chan].keyOn=false;
+      chan[c.chan].active=false;
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_VOLUME: {
+      chan[c.chan].vol=c.value;
+      if (!chan[c.chan].std.vol.has) {
+        chan[c.chan].outVol=c.value;
+      }
+      if (c.chan>14) { // ADPCM-B
+        immWrite(0x1b,chan[c.chan].outVol);
+        break;
+      }
+      if (c.chan>8) { // ADPCM-A
+        immWrite(0x108+(c.chan-9),isMuted[c.chan]?0:((chan[c.chan].pan<<6)|chan[c.chan].vol));
+        break;
+      }
+      for (int i=0; i<4; i++) {
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+        if (isOutput[chan[c.chan].state.alg][i]) {
+          rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+        } else {
+          rWrite(baseAddr+ADDR_TL,op.tl);
+        }
+      }
+      break;
+    }
+    case DIV_CMD_GET_VOLUME: {
+      return chan[c.chan].vol;
+      break;
+    }
+    case DIV_CMD_INSTRUMENT:
+      if (chan[c.chan].ins!=c.value || c.value2==1) {
+        chan[c.chan].insChanged=true;
+      }
+      chan[c.chan].ins=c.value;
+      break;
+    case DIV_CMD_PANNING: {
+      if (c.value==0 && c.value2==0) {
+        chan[c.chan].pan=3;
+      } else {
+        chan[c.chan].pan=(c.value2>0)|((c.value>0)<<1);
+      }
+      if (c.chan>14) {
+        immWrite(0x11,isMuted[c.chan]?0:(chan[c.chan].pan<<6));
+        break;
+      }
+      if (c.chan>8) {
+        immWrite(0x108+(c.chan-9),isMuted[c.chan]?0:((chan[c.chan].pan<<6)|chan[c.chan].vol));
+        break;
+      }
+      rWrite(chanOffs[c.chan]+ADDR_LRAF,(isMuted[c.chan]?0:(chan[c.chan].pan<<6))|(chan[c.chan].state.fms&7)|((chan[c.chan].state.ams&3)<<4));
+      break;
+    }
+    case DIV_CMD_PITCH: {
+      chan[c.chan].pitch=c.value;
+      chan[c.chan].freqChanged=true;
+      break;
+    }
+    case DIV_CMD_NOTE_PORTA: {
+      if (c.chan>5 || parent->song.linearPitch==2) { // PSG, ADPCM-B
+        int destFreq=NOTE_OPNB(c.chan,c.value2);
+        bool return2=false;
+        if (destFreq>chan[c.chan].baseFreq) {
+          chan[c.chan].baseFreq+=c.value;
+          if (chan[c.chan].baseFreq>=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          chan[c.chan].baseFreq-=c.value;
+          if (chan[c.chan].baseFreq<=destFreq) {
+            chan[c.chan].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        chan[c.chan].freqChanged=true;
+        if (return2) {
+          chan[c.chan].inPorta=false;
+          return 2;
+        }
+        break;
+      }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
+      int newFreq;
+      bool return2=false;
+      if (chan[c.chan].portaPause) {
+        chan[c.chan].baseFreq=chan[c.chan].portaPauseFreq;
+      }
+      if (destFreq>chan[c.chan].baseFreq) {
+        newFreq=chan[c.chan].baseFreq+c.value;
+        if (newFreq>=destFreq) {
+          newFreq=destFreq;
+          return2=true;
+        }
+      } else {
+        newFreq=chan[c.chan].baseFreq-c.value;
+        if (newFreq<=destFreq) {
+          newFreq=destFreq;
+          return2=true;
+        }
+      }
+      // check for octave boundary
+      // what the heck!
+      if (!chan[c.chan].portaPause) {
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+      }
+      chan[c.chan].portaPause=false;
+      chan[c.chan].freqChanged=true;
+      chan[c.chan].baseFreq=newFreq;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
+      break;
+    }
+    case DIV_CMD_SAMPLE_BANK:
+      sampleBank=c.value;
+      if (sampleBank>(parent->song.sample.size()/12)) {
+        sampleBank=parent->song.sample.size()/12;
+      }
+      iface.sampleBank=sampleBank;
+      break;
+    case DIV_CMD_LEGATO: {
+      chan[c.chan].baseFreq=NOTE_OPNB(c.chan,c.value);
+      chan[c.chan].freqChanged=true;
+      break;
+    }
+    case DIV_CMD_FM_LFO: {
+      rWrite(0x22,(c.value&7)|((c.value>>4)<<3));
+      break;
+    }
+    case DIV_CMD_FM_FB: {
+      if (c.chan>5) break;
+      chan[c.chan].state.fb=c.value&7;
+      rWrite(chanOffs[c.chan]+ADDR_FB_ALG,(chan[c.chan].state.alg&7)|(chan[c.chan].state.fb<<3));
+      break;
+    }
+    case DIV_CMD_FM_MULT: {
+      if (c.chan>5) break;
+      unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+      DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+      op.mult=c.value2&15;
+      rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      break;
+    }
+    case DIV_CMD_FM_TL: {
+      if (c.chan>5) break;
+      unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+      DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+      op.tl=c.value2;
+      if (isOutput[chan[c.chan].state.alg][c.value]) {
+        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[c.chan].outVol&0x7f))/127));
+      } else {
+        rWrite(baseAddr+ADDR_TL,op.tl);
+      }
+      break;
+    }
+    case DIV_CMD_FM_AR: {
+      if (c.chan>5) break;
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.ar=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+        }
+      } else {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.ar=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      break;
+    }
+    case DIV_CMD_FM_RS: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.rs=c.value2&3;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.rs=c.value2&3;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      }
+      break;
+    }
+    case DIV_CMD_FM_AM: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.am=c.value2&1;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.am=c.value2&1;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      break;
+    }
+    case DIV_CMD_FM_DR: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.dr=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.dr=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      }
+      break;
+    }
+    case DIV_CMD_FM_SL: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.sl=c.value2&15;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.sl=c.value2&15;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_RR: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.rr=c.value2&15;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.rr=c.value2&15;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_D2R: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.d2r=c.value2&31;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.d2r=c.value2&31;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      }
+      break;
+    }
+    case DIV_CMD_FM_DT: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.dt=c.value&7;
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.dt=c.value2&7;
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      }
+      break;
+    }
+    case DIV_CMD_FM_SSG: {
+      if (c.value<0)  {
+        for (int i=0; i<4; i++) {
+          DivInstrumentFM::Operator& op=chan[c.chan].state.op[i];
+          op.ssgEnv=8^(c.value2&15);
+          unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
+          rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+        }
+      } else if (c.value<4) {
+        DivInstrumentFM::Operator& op=chan[c.chan].state.op[orderedOps[c.value]];
+        op.ssgEnv=8^(c.value2&15);
+        unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
+        rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+      }
+      break;
+    }
+    case DIV_CMD_FM_HARD_RESET:
+      chan[c.chan].hardReset=c.value;
+      break;
+    case DIV_ALWAYS_SET_VOLUME:
+      return 0;
+      break;
+    case DIV_CMD_GET_VOLMAX:
+      if (c.chan>14) return 255;
+      if (c.chan>8) return 31;
+      if (c.chan>5) return 15;
+      return 127;
+      break;
+    case DIV_CMD_PRE_PORTA:
+      if (c.chan>5) {
+        if (chan[c.chan].active && c.value2) {
+          if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_FM));
+        }
+      }
+      chan[c.chan].inPorta=c.value;
+      break;
+    case DIV_CMD_PRE_NOTE:
+      break;
+    default:
+      //printf("WARNING: unimplemented command %d\n",c.cmd);
+      break;
+  }
+  return 1;
+}
+
+void DivPlatformYM2610B::muteChannel(int ch, bool mute) {
+  isMuted[ch]=mute;
+  if (ch>14) { // ADPCM-B
+    immWrite(0x11,isMuted[ch]?0:(chan[ch].pan<<6));
+  }
+  if (ch>8) { // ADPCM-A
+    immWrite(0x108+(ch-9),isMuted[ch]?0:((chan[ch].pan<<6)|chan[ch].vol));
+    return;
+  }
+  if (ch>5) { // PSG
+    ay->muteChannel(ch-6,mute);
+    return;
+  }
+  // FM
+  rWrite(chanOffs[ch]+ADDR_LRAF,(isMuted[ch]?0:(chan[ch].pan<<6))|(chan[ch].state.fms&7)|((chan[ch].state.ams&3)<<4));
+}
+
+void DivPlatformYM2610B::forceIns() {
+  for (int i=0; i<6; i++) {
+    for (int j=0; j<4; j++) {
+      unsigned short baseAddr=chanOffs[i]|opOffs[j];
+      DivInstrumentFM::Operator& op=chan[i].state.op[j];
+      if (isOutput[chan[i].state.alg][j]) {
+        rWrite(baseAddr+ADDR_TL,127-(((127-op.tl)*(chan[i].outVol&0x7f))/127));
+      } else {
+        rWrite(baseAddr+ADDR_TL,op.tl);
+      }
+      rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
+      rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
+      rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
+      rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
+      rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
+      rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
+    }
+    rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
+    rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
+    if (chan[i].active) {
+      chan[i].keyOn=true;
+      chan[i].freqChanged=true;
+    }
+  }
+  for (int i=9; i<16; i++) {
+    chan[i].insChanged=true;
+  }
+
+  ay->forceIns();
+  ay->flushWrites();
+  for (DivRegWrite& i: ay->getRegisterWrites()) {
+    immWrite(i.addr&15,i.val);
+  }
+  ay->getRegisterWrites().clear();
+}
+
+void* DivPlatformYM2610B::getChanState(int ch) {
+  return &chan[ch];
+}
+
+DivDispatchOscBuffer* DivPlatformYM2610B::getOscBuffer(int ch) {
+  return oscBuf[ch];
+}
+
+unsigned char* DivPlatformYM2610B::getRegisterPool() {
+  return regPool;
+}
+
+int DivPlatformYM2610B::getRegisterPoolSize() {
+  return 512;
+}
+
+void DivPlatformYM2610B::poke(unsigned int addr, unsigned short val) {
+  immWrite(addr,val);
+}
+
+void DivPlatformYM2610B::poke(std::vector<DivRegWrite>& wlist) {
+  for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
+}
+
+void DivPlatformYM2610B::reset() {
+  while (!writes.empty()) writes.pop();
+  memset(regPool,0,512);
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
+  fm->reset();
+  for (int i=0; i<16; i++) {
+    chan[i]=DivPlatformYM2610B::Channel();
+    chan[i].std.setEngine(parent);
+  }
+  for (int i=0; i<6; i++) {
+    chan[i].vol=0x7f;
+    chan[i].outVol=0x7f;
+  }
+  for (int i=6; i<9; i++) {
+    chan[i].vol=0x0f;
+  }
+  for (int i=9; i<15; i++) {
+    chan[i].vol=0x1f;
+  }
+  chan[15].vol=0xff;
+
+  for (int i=0; i<512; i++) {
+    oldWrites[i]=-1;
+    pendingWrites[i]=-1;
+  }
+
+  lastBusy=60;
+  sampleBank=0;
+
+  delay=0;
+
+  extMode=false;
+
+  // LFO
+  immWrite(0x22,0x08);
+
+  // PCM volume
+  immWrite(0x101,0x3f); // A
+  immWrite(0x1b,0xff); // B
+
+  ay->reset();
+  ay->getRegisterWrites().clear();
+  ay->flushWrites();
+}
+
+bool DivPlatformYM2610B::isStereo() {
+  return true;
+}
+
+bool DivPlatformYM2610B::keyOffAffectsArp(int ch) {
+  return (ch>5);
+}
+
+void DivPlatformYM2610B::notifyInsChange(int ins) {
+  for (int i=0; i<16; i++) {
+    if (chan[i].ins==ins) {
+      chan[i].insChanged=true;
+    }
+  }
+  ay->notifyInsChange(ins);
+}
+
+void DivPlatformYM2610B::notifyInsDeletion(void* ins) {
+  ay->notifyInsDeletion(ins);
+}
+
+void DivPlatformYM2610B::setSkipRegisterWrites(bool value) {
+  DivDispatch::setSkipRegisterWrites(value);
+  ay->setSkipRegisterWrites(value);
+}
+
+int DivPlatformYM2610B::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
+  DivPlatformYM2610Base::init(p, channels, sugRate, flags);
+  dumpWrites=false;
+  skipRegisterWrites=false;
+  for (int i=0; i<16; i++) {
+    isMuted[i]=false;
+    oscBuf[i]=new DivDispatchOscBuffer;
+  }
+  chipClock=8000000;
+  rate=chipClock/16;
+  for (int i=0; i<16; i++) {
+    oscBuf[i]->rate=rate;
+  }
+  fm=new ymfm::ym2610b(iface);
+  // YM2149, 2MHz
+  ay=new DivPlatformAY8910;
+  ay->init(p,3,sugRate,35);
+  ay->toggleRegisterDump(true);
+  reset();
+  return 16;
+}
+
+void DivPlatformYM2610B::quit() {
+  for (int i=0; i<16; i++) {
+    delete oscBuf[i];
+  }
+  ay->quit();
+  delete ay;
+  delete fm;
+  DivPlatformYM2610Base::quit();
+}
+
+DivPlatformYM2610B::~DivPlatformYM2610B() {
+}
diff --git a/src/engine/platform/ym2608.h b/src/engine/platform/ym2608.h
new file mode 100644
index 00000000..0de28f6f
--- /dev/null
+++ b/src/engine/platform/ym2608.h
@@ -0,0 +1,130 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _YM2608_H
+#define _YM2608_H
+#include "../dispatch.h"
+#include "../macroInt.h"
+#include <queue>
+#include "sound/ymfm/ymfm_opn.h"
+
+#include "ym2610.h"
+
+class DivPlatformYM2608: public DivPlatformYM2610Base {
+  protected:
+    const unsigned short chanOffs[6]={
+      0x00, 0x01, 0x02, 0x100, 0x101, 0x102
+    };
+
+    struct Channel {
+      DivInstrumentFM state;
+      unsigned char freqH, freqL;
+      int freq, baseFreq, pitch, pitch2, portaPauseFreq, note, ins;
+      unsigned char psgMode, autoEnvNum, autoEnvDen;
+      signed char konCycles;
+      bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta, furnacePCM, hardReset;
+      int vol, outVol;
+      int sample;
+      unsigned char pan;
+      DivMacroInt std;
+      void macroInit(DivInstrument* which) {
+        std.init(which);
+        pitch2=0;
+      }
+      Channel():
+        freqH(0),
+        freqL(0),
+        freq(0),
+        baseFreq(0),
+        pitch(0),
+        pitch2(0),
+        portaPauseFreq(0),
+        note(0),
+        ins(-1),
+        psgMode(1),
+        autoEnvNum(0),
+        autoEnvDen(0),
+        active(false),
+        insChanged(true),
+        freqChanged(false),
+        keyOn(false),
+        keyOff(false),
+        portaPause(false),
+        inPorta(false),
+        furnacePCM(false),
+        hardReset(false),
+        vol(0),
+        outVol(15),
+        sample(-1),
+        pan(3) {}
+    };
+    Channel chan[16];
+    DivDispatchOscBuffer* oscBuf[16];
+    bool isMuted[16];
+    struct QueuedWrite {
+      unsigned short addr;
+      unsigned char val;
+      bool addrOrVal;
+      QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
+    };
+    std::queue<QueuedWrite> writes;
+    ymfm::ym2608* fm;
+    ymfm::ym2608::output_data fmout;
+    unsigned char regPool[512];
+    unsigned char lastBusy;
+  
+    DivPlatformAY8910* ay;
+    unsigned char sampleBank;
+
+    int delay;
+
+    bool extMode;
+  
+    short oldWrites[512];
+    short pendingWrites[512];
+
+    double NOTE_OPNB(int ch, int note);
+    double NOTE_ADPCMB(int note);
+    friend void putDispatchChan(void*,int,int);
+  
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    bool keyOffAffectsArp(int ch);
+    void notifyInsChange(int ins);
+    void notifyInsDeletion(void* ins);
+    void setSkipRegisterWrites(bool val);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void quit();
+    ~DivPlatformYM2608();
+};
+#endif
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 54bbbd21..397f6a8f 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -456,13 +456,13 @@ double DivPlatformYM2610::NOTE_OPNB(int ch, int note) {
     return NOTE_PERIODIC(note);
   }
   // FM
-  return NOTE_FREQUENCY(note);
+  return NOTE_FNUM_BLOCK(note,11);
 }
 
 double DivPlatformYM2610::NOTE_ADPCMB(int note) {
   if (chan[13].sample>=0 && chan[13].sample<parent->song.sampleLen) {
-    double off=(double)(parent->getSample(chan[13].sample)->centerRate)/8363.0;
-    return off*parent->calcBaseFreq((double)chipClock/144,65535,note,false);
+    double off=65535.0*(double)(parent->getSample(chan[13].sample)->centerRate)/8363.0;
+    return parent->calcBaseFreq((double)chipClock/144,off,note,false);
   }
   return 0;
 }
@@ -559,15 +559,15 @@ void DivPlatformYM2610::tick(bool sysTick) {
     if (chan[i].std.arp.had) {
       if (!chan[i].inPorta) {
         if (chan[i].std.arp.mode) {
-          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].std.arp.val,11);
         } else {
-          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+(signed char)chan[i].std.arp.val);
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note+(signed char)chan[i].std.arp.val,11);
         }
       }
       chan[i].freqChanged=true;
     } else {
       if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
-        chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
+        chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note,11);
         chan[i].freqChanged=true;
       }
     }
@@ -726,7 +726,12 @@ void DivPlatformYM2610::tick(bool sysTick) {
     }
   }
   if (chan[13].freqChanged) {
-    chan[13].freq=parent->calcFreq(chan[13].baseFreq,chan[13].pitch,false,4);
+    if (chan[13].sample>=0 && chan[13].sample<parent->song.sampleLen) {
+      double off=65535.0*(double)(parent->getSample(chan[13].sample)->centerRate)/8363.0;
+      chan[13].freq=parent->calcFreq(chan[13].baseFreq,chan[13].pitch,false,4,chan[13].pitch2,(double)chipClock/144,off);
+    } else {
+      chan[13].freq=0;
+    }
     immWrite(0x19,chan[13].freq&0xff);
     immWrite(0x1a,(chan[13].freq>>8)&0xff);
     chan[13].freqChanged=false;
@@ -742,11 +747,24 @@ void DivPlatformYM2610::tick(bool sysTick) {
   for (int i=0; i<4; i++) {
     if (i==1 && extMode) continue;
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2);
-      if (chan[i].freq>262143) chan[i].freq=262143;
-      int freqt=toFreq(chan[i].freq)+chan[i].pitch2;
-      immWrite(chanOffs[i]+ADDR_FREQH,freqt>>8);
-      immWrite(chanOffs[i]+ADDR_FREQ,freqt&0xff);
+      if (parent->song.linearPitch==2) {
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+        int block=(chan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        chan[i].freq=(block<<11)|fNum;
+      }
+      if (chan[i].freq>0x3fff) chan[i].freq=0x3fff;
+      immWrite(chanOffs[i]+ADDR_FREQH,chan[i].freq>>8);
+      immWrite(chanOffs[i]+ADDR_FREQ,chan[i].freq&0xff);
       chan[i].freqChanged=false;
     }
     if (chan[i].keyOn) {
@@ -756,47 +774,6 @@ void DivPlatformYM2610::tick(bool sysTick) {
   }
 }
 
-int DivPlatformYM2610::octave(int freq) {
-  if (freq>=622.0f*128) {
-    return 128;
-  } else if (freq>=622.0f*64) {
-    return 64;
-  } else if (freq>=622.0f*32) {
-    return 32;
-  } else if (freq>=622.0f*16) {
-    return 16;
-  } else if (freq>=622.0f*8) {
-    return 8;
-  } else if (freq>=622.0f*4) {
-    return 4;
-  } else if (freq>=622.0f*2) {
-    return 2;
-  } else {
-    return 1;
-  }
-  return 1;
-}
-
-int DivPlatformYM2610::toFreq(int freq) {
-  if (freq>=622.0f*128) {
-    return 0x3800|((freq>>7)&0x7ff);
-  } else if (freq>=622.0f*64) {
-    return 0x3000|((freq>>6)&0x7ff);
-  } else if (freq>=622.0f*32) {
-    return 0x2800|((freq>>5)&0x7ff);
-  } else if (freq>=622.0f*16) {
-    return 0x2000|((freq>>4)&0x7ff);
-  } else if (freq>=622.0f*8) {
-    return 0x1800|((freq>>3)&0x7ff);
-  } else if (freq>=622.0f*4) {
-    return 0x1000|((freq>>2)&0x7ff);
-  } else if (freq>=622.0f*2) {
-    return 0x800|((freq>>1)&0x7ff);
-  } else {
-    return freq&0x7ff;
-  }
-}
-
 int DivPlatformYM2610::dispatch(DivCommand c) {
   if (c.chan>3 && c.chan<7) {
     c.chan-=4;
@@ -928,7 +905,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
       chan[c.chan].insChanged=false;
 
       if (c.value!=DIV_NOTE_NULL) {
-        chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
         chan[c.chan].portaPause=false;
         chan[c.chan].freqChanged=true;
         chan[c.chan].note=c.value;
@@ -1025,7 +1002,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      if (c.chan>3) { // PSG, ADPCM-B
+      if (c.chan>3 || parent->song.linearPitch==2) { // PSG, ADPCM-B
         int destFreq=NOTE_OPNB(c.chan,c.value2);
         bool return2=false;
         if (destFreq>chan[c.chan].baseFreq) {
@@ -1048,33 +1025,48 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
         }
         break;
       }
-
-      int destFreq=NOTE_FREQUENCY(c.value2);
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
+      if (chan[c.chan].portaPause) {
+        chan[c.chan].baseFreq=chan[c.chan].portaPauseFreq;
+      }
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq+c.value;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq-c.value;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       }
+      // check for octave boundary
+      // what the heck!
       if (!chan[c.chan].portaPause) {
-        if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
           chan[c.chan].portaPause=true;
           break;
         }
       }
-      chan[c.chan].baseFreq=newFreq;
       chan[c.chan].portaPause=false;
       chan[c.chan].freqChanged=true;
-      if (return2) return 2;
+      chan[c.chan].baseFreq=newFreq;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
       break;
     }
     case DIV_CMD_SAMPLE_BANK:
diff --git a/src/engine/platform/ym2610.h b/src/engine/platform/ym2610.h
index 45ecb335..92f4ca07 100644
--- a/src/engine/platform/ym2610.h
+++ b/src/engine/platform/ym2610.h
@@ -61,7 +61,7 @@ class DivPlatformYM2610: public DivPlatformYM2610Base {
     struct Channel {
       DivInstrumentFM state;
       unsigned char freqH, freqL;
-      int freq, baseFreq, pitch, pitch2, note, ins;
+      int freq, baseFreq, pitch, pitch2, portaPauseFreq, note, ins;
       unsigned char psgMode, autoEnvNum, autoEnvDen;
       signed char konCycles;
       bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta, furnacePCM, hardReset;
@@ -80,6 +80,7 @@ class DivPlatformYM2610: public DivPlatformYM2610Base {
         baseFreq(0),
         pitch(0),
         pitch2(0),
+        portaPauseFreq(0),
         note(0),
         ins(-1),
         psgMode(1),
@@ -125,8 +126,6 @@ class DivPlatformYM2610: public DivPlatformYM2610Base {
     short oldWrites[512];
     short pendingWrites[512];
 
-    int octave(int freq);
-    int toFreq(int freq);
     double NOTE_OPNB(int ch, int note);
     double NOTE_ADPCMB(int note);
     friend void putDispatchChan(void*,int,int);
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index b36cc87f..cd40fe13 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -436,13 +436,13 @@ double DivPlatformYM2610B::NOTE_OPNB(int ch, int note) {
     return NOTE_PERIODIC(note);
   }
   // FM
-  return NOTE_FREQUENCY(note);
+  return NOTE_FNUM_BLOCK(note,11);
 }
 
 double DivPlatformYM2610B::NOTE_ADPCMB(int note) {
   if (chan[15].sample>=0 && chan[15].sample<parent->song.sampleLen) {
-    double off=(double)(parent->getSample(chan[15].sample)->centerRate)/8363.0;
-    return off*parent->calcBaseFreq((double)chipClock/144,65535,note,false);
+    double off=65535.0*(double)(parent->getSample(chan[15].sample)->centerRate)/8363.0;
+    return parent->calcBaseFreq((double)chipClock/144,off,note,false);
   }
   return 0;
 }
@@ -538,15 +538,15 @@ void DivPlatformYM2610B::tick(bool sysTick) {
     if (chan[i].std.arp.had) {
       if (!chan[i].inPorta) {
         if (chan[i].std.arp.mode) {
-          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].std.arp.val,11);
         } else {
-          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+(signed char)chan[i].std.arp.val);
+          chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note+(signed char)chan[i].std.arp.val,11);
         }
       }
       chan[i].freqChanged=true;
     } else {
       if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
-        chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
+        chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note,11);
         chan[i].freqChanged=true;
       }
     }
@@ -704,7 +704,12 @@ void DivPlatformYM2610B::tick(bool sysTick) {
     }
   }
   if (chan[15].freqChanged) {
-    chan[15].freq=parent->calcFreq(chan[15].baseFreq,chan[15].pitch,false,4);
+    if (chan[15].sample>=0 && chan[15].sample<parent->song.sampleLen) {
+      double off=65535.0*(double)(parent->getSample(chan[15].sample)->centerRate)/8363.0;
+      chan[15].freq=parent->calcFreq(chan[15].baseFreq,chan[15].pitch,false,4,chan[15].pitch2,(double)chipClock/144,off);
+    } else {
+      chan[15].freq=0;
+    }
     immWrite(0x19,chan[15].freq&0xff);
     immWrite(0x1a,(chan[15].freq>>8)&0xff);
     chan[15].freqChanged=false;
@@ -720,11 +725,24 @@ void DivPlatformYM2610B::tick(bool sysTick) {
   for (int i=0; i<6; i++) {
     if (i==2 && extMode) continue;
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2);
-      if (chan[i].freq>262143) chan[i].freq=262143;
-      int freqt=toFreq(chan[i].freq)+chan[i].pitch2;
-      immWrite(chanOffs[i]+ADDR_FREQH,freqt>>8);
-      immWrite(chanOffs[i]+ADDR_FREQ,freqt&0xff);
+      if (parent->song.linearPitch==2) {
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2);
+        int block=(chan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        chan[i].freq=(block<<11)|fNum;
+      }
+      if (chan[i].freq>0x3fff) chan[i].freq=0x3fff;
+      immWrite(chanOffs[i]+ADDR_FREQH,chan[i].freq>>8);
+      immWrite(chanOffs[i]+ADDR_FREQ,chan[i].freq&0xff);
       chan[i].freqChanged=false;
     }
     if (chan[i].keyOn) {
@@ -734,47 +752,6 @@ void DivPlatformYM2610B::tick(bool sysTick) {
   }
 }
 
-int DivPlatformYM2610B::octave(int freq) {
-  if (freq>=622.0f*128) {
-    return 128;
-  } else if (freq>=622.0f*64) {
-    return 64;
-  } else if (freq>=622.0f*32) {
-    return 32;
-  } else if (freq>=622.0f*16) {
-    return 16;
-  } else if (freq>=622.0f*8) {
-    return 8;
-  } else if (freq>=622.0f*4) {
-    return 4;
-  } else if (freq>=622.0f*2) {
-    return 2;
-  } else {
-    return 1;
-  }
-  return 1;
-}
-
-int DivPlatformYM2610B::toFreq(int freq) {
-  if (freq>=622.0f*128) {
-    return 0x3800|((freq>>7)&0x7ff);
-  } else if (freq>=622.0f*64) {
-    return 0x3000|((freq>>6)&0x7ff);
-  } else if (freq>=622.0f*32) {
-    return 0x2800|((freq>>5)&0x7ff);
-  } else if (freq>=622.0f*16) {
-    return 0x2000|((freq>>4)&0x7ff);
-  } else if (freq>=622.0f*8) {
-    return 0x1800|((freq>>3)&0x7ff);
-  } else if (freq>=622.0f*4) {
-    return 0x1000|((freq>>2)&0x7ff);
-  } else if (freq>=622.0f*2) {
-    return 0x800|((freq>>1)&0x7ff);
-  } else {
-    return freq&0x7ff;
-  }
-}
-
 int DivPlatformYM2610B::dispatch(DivCommand c) {
   if (c.chan>5 && c.chan<9) {
     c.chan-=6;
@@ -906,7 +883,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
       chan[c.chan].insChanged=false;
 
       if (c.value!=DIV_NOTE_NULL) {
-        chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
         chan[c.chan].portaPause=false;
         chan[c.chan].freqChanged=true;
         chan[c.chan].note=c.value;
@@ -1003,7 +980,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      if (c.chan>5) { // PSG, ADPCM-B
+      if (c.chan>5 || parent->song.linearPitch==2) { // PSG, ADPCM-B
         int destFreq=NOTE_OPNB(c.chan,c.value2);
         bool return2=false;
         if (destFreq>chan[c.chan].baseFreq) {
@@ -1026,33 +1003,48 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
         }
         break;
       }
-
-      int destFreq=NOTE_FREQUENCY(c.value2);
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
+      if (chan[c.chan].portaPause) {
+        chan[c.chan].baseFreq=chan[c.chan].portaPauseFreq;
+      }
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq+c.value;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
+        newFreq=chan[c.chan].baseFreq-c.value;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       }
+      // check for octave boundary
+      // what the heck!
       if (!chan[c.chan].portaPause) {
-        if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+          chan[c.chan].portaPause=true;
+          break;
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
           chan[c.chan].portaPause=true;
           break;
         }
       }
-      chan[c.chan].baseFreq=newFreq;
       chan[c.chan].portaPause=false;
       chan[c.chan].freqChanged=true;
-      if (return2) return 2;
+      chan[c.chan].baseFreq=newFreq;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
       break;
     }
     case DIV_CMD_SAMPLE_BANK:
diff --git a/src/engine/platform/ym2610b.h b/src/engine/platform/ym2610b.h
index d1af3069..3a034028 100644
--- a/src/engine/platform/ym2610b.h
+++ b/src/engine/platform/ym2610b.h
@@ -35,7 +35,7 @@ class DivPlatformYM2610B: public DivPlatformYM2610Base {
     struct Channel {
       DivInstrumentFM state;
       unsigned char freqH, freqL;
-      int freq, baseFreq, pitch, pitch2, note, ins;
+      int freq, baseFreq, pitch, pitch2, portaPauseFreq, note, ins;
       unsigned char psgMode, autoEnvNum, autoEnvDen;
       signed char konCycles;
       bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta, furnacePCM, hardReset;
@@ -54,6 +54,7 @@ class DivPlatformYM2610B: public DivPlatformYM2610Base {
         baseFreq(0),
         pitch(0),
         pitch2(0),
+        portaPauseFreq(0),
         note(0),
         ins(-1),
         psgMode(1),
@@ -98,8 +99,6 @@ class DivPlatformYM2610B: public DivPlatformYM2610Base {
     short oldWrites[512];
     short pendingWrites[512];
 
-    int octave(int freq);
-    int toFreq(int freq);
     double NOTE_OPNB(int ch, int note);
     double NOTE_ADPCMB(int note);
     friend void putDispatchChan(void*,int,int);
diff --git a/src/engine/platform/ym2610bext.cpp b/src/engine/platform/ym2610bext.cpp
index 03b91fcc..440dce6a 100644
--- a/src/engine/platform/ym2610bext.cpp
+++ b/src/engine/platform/ym2610bext.cpp
@@ -120,31 +120,74 @@ int DivPlatformYM2610BExt::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      int destFreq=NOTE_FREQUENCY(c.value2);
+      if (parent->song.linearPitch==2) {
+        int destFreq=NOTE_FREQUENCY(c.value2);
+        bool return2=false;
+        if (destFreq>opChan[ch].baseFreq) {
+          opChan[ch].baseFreq+=c.value;
+          if (opChan[ch].baseFreq>=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          opChan[ch].baseFreq-=c.value;
+          if (opChan[ch].baseFreq<=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        opChan[ch].freqChanged=true;
+        if (return2) {
+          //opChan[ch].inPorta=false;
+          return 2;
+        }
+        break;
+      }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
+      if (opChan[ch].portaPause) {
+        opChan[ch].baseFreq=opChan[ch].portaPauseFreq;
+      }
       if (destFreq>opChan[ch].baseFreq) {
-        newFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
+        newFreq=opChan[ch].baseFreq+c.value;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
+        newFreq=opChan[ch].baseFreq-c.value;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       }
+      // what the heck!
       if (!opChan[ch].portaPause) {
-        if (octave(opChan[ch].baseFreq)!=octave(newFreq)) {
-          opChan[ch].portaPause=true;
-          break;
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          if (parent->song.fbPortaPause) {
+            opChan[ch].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+            opChan[ch].portaPause=true;
+            break;
+          } else {
+            newFreq=(newFreq>>1)|((newFreq+0x800)&0xf800);
+          }
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          if (parent->song.fbPortaPause) {
+            opChan[ch].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
+            opChan[ch].portaPause=true;
+            break;
+          } else {
+            newFreq=(newFreq<<1)|((newFreq-0x800)&0xf800);
+          }
         }
       }
-      opChan[ch].baseFreq=newFreq;
       opChan[ch].portaPause=false;
       opChan[ch].freqChanged=true;
+      opChan[ch].baseFreq=newFreq;
       if (return2) return 2;
       break;
     }
@@ -364,14 +407,24 @@ void DivPlatformYM2610BExt::tick(bool sysTick) {
   unsigned char writeMask=2;
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
-      opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,octave(opChan[i].baseFreq),opChan[i].pitch2);
-      if (opChan[i].freq>262143) opChan[i].freq=262143;
-      int freqt=toFreq(opChan[i].freq);
-      opChan[i].freqH=freqt>>8;
-      opChan[i].freqL=freqt&0xff;
-      immWrite(opChanOffsH[i],opChan[i].freqH);
-      immWrite(opChanOffsL[i],opChan[i].freqL);
-      opChan[i].freqChanged=false;
+      if (parent->song.linearPitch==2) {
+        opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,4,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,4,opChan[i].pitch2);
+        int block=(opChan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        opChan[i].freq=(block<<11)|fNum;
+      }
+      if (opChan[i].freq>0x3fff) opChan[i].freq=0x3fff;
+      immWrite(opChanOffsH[i],opChan[i].freq>>8);
+      immWrite(opChanOffsL[i],opChan[i].freq&0xff);
     }
     writeMask|=opChan[i].active<<(4+i);
     if (opChan[i].keyOn) {
diff --git a/src/engine/platform/ym2610bext.h b/src/engine/platform/ym2610bext.h
index b416b5c7..4e3f7c5f 100644
--- a/src/engine/platform/ym2610bext.h
+++ b/src/engine/platform/ym2610bext.h
@@ -25,12 +25,12 @@ class DivPlatformYM2610BExt: public DivPlatformYM2610B {
   struct OpChannel {
     DivMacroInt std;
     unsigned char freqH, freqL;
-    int freq, baseFreq, pitch, pitch2, ins;
+    int freq, baseFreq, pitch, pitch2, portaPauseFreq, ins;
     signed char konCycles;
     bool active, insChanged, freqChanged, keyOn, keyOff, portaPause;
     int vol;
     unsigned char pan;
-    OpChannel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), pitch2(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), vol(0), pan(3) {}
+    OpChannel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), pitch2(0), portaPauseFreq(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), vol(0), pan(3) {}
   };
   OpChannel opChan[4];
   bool isOpMuted[4];
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 1ffbd74f..b12fd3de 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -63,7 +63,7 @@ int DivPlatformYM2610Ext::dispatch(DivCommand c) {
       opChan[ch].insChanged=false;
 
       if (c.value!=DIV_NOTE_NULL) {
-        opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
+        opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
         opChan[ch].portaPause=false;
         opChan[ch].freqChanged=true;
       }
@@ -120,36 +120,79 @@ int DivPlatformYM2610Ext::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      int destFreq=NOTE_FREQUENCY(c.value2);
+      if (parent->song.linearPitch==2) {
+        int destFreq=NOTE_FREQUENCY(c.value2);
+        bool return2=false;
+        if (destFreq>opChan[ch].baseFreq) {
+          opChan[ch].baseFreq+=c.value;
+          if (opChan[ch].baseFreq>=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        } else {
+          opChan[ch].baseFreq-=c.value;
+          if (opChan[ch].baseFreq<=destFreq) {
+            opChan[ch].baseFreq=destFreq;
+            return2=true;
+          }
+        }
+        opChan[ch].freqChanged=true;
+        if (return2) {
+          //opChan[ch].inPorta=false;
+          return 2;
+        }
+        break;
+      }
+      int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
+      int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
+      int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
       int newFreq;
       bool return2=false;
+      if (opChan[ch].portaPause) {
+        opChan[ch].baseFreq=opChan[ch].portaPauseFreq;
+      }
       if (destFreq>opChan[ch].baseFreq) {
-        newFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
+        newFreq=opChan[ch].baseFreq+c.value;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
+        newFreq=opChan[ch].baseFreq-c.value;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       }
+      // what the heck!
       if (!opChan[ch].portaPause) {
-        if (octave(opChan[ch].baseFreq)!=octave(newFreq)) {
-          opChan[ch].portaPause=true;
-          break;
+        if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
+          if (parent->song.fbPortaPause) {
+            opChan[ch].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
+            opChan[ch].portaPause=true;
+            break;
+          } else {
+            newFreq=(newFreq>>1)|((newFreq+0x800)&0xf800);
+          }
+        }
+        if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
+          if (parent->song.fbPortaPause) {
+            opChan[ch].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
+            opChan[ch].portaPause=true;
+            break;
+          } else {
+            newFreq=(newFreq<<1)|((newFreq-0x800)&0xf800);
+          }
         }
       }
-      opChan[ch].baseFreq=newFreq;
       opChan[ch].portaPause=false;
       opChan[ch].freqChanged=true;
+      opChan[ch].baseFreq=newFreq;
       if (return2) return 2;
       break;
     }
     case DIV_CMD_LEGATO: {
-      opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
+      opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
       opChan[ch].freqChanged=true;
       break;
     }
@@ -364,14 +407,24 @@ void DivPlatformYM2610Ext::tick(bool sysTick) {
   unsigned char writeMask=2;
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
-      opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,octave(opChan[i].baseFreq),opChan[i].pitch2);
-      if (opChan[i].freq>262143) opChan[i].freq=262143;
-      int freqt=toFreq(opChan[i].freq);
-      opChan[i].freqH=freqt>>8;
-      opChan[i].freqL=freqt&0xff;
-      immWrite(opChanOffsH[i],opChan[i].freqH);
-      immWrite(opChanOffsL[i],opChan[i].freqL);
-      opChan[i].freqChanged=false;
+      if (parent->song.linearPitch==2) {
+        opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,4,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+      } else {
+        int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,4,opChan[i].pitch2);
+        int block=(opChan[i].baseFreq&0xf800)>>11;
+        if (fNum<0) fNum=0;
+        if (fNum>2047) {
+          while (block<7) {
+            fNum>>=1;
+            block++;
+          }
+          if (fNum>2047) fNum=2047;
+        }
+        opChan[i].freq=(block<<11)|fNum;
+      }
+      if (opChan[i].freq>0x3fff) opChan[i].freq=0x3fff;
+      immWrite(opChanOffsH[i],opChan[i].freq>>8);
+      immWrite(opChanOffsL[i],opChan[i].freq&0xff);
     }
     writeMask|=opChan[i].active<<(4+i);
     if (opChan[i].keyOn) {
diff --git a/src/engine/platform/ym2610ext.h b/src/engine/platform/ym2610ext.h
index 10be6638..287bf08b 100644
--- a/src/engine/platform/ym2610ext.h
+++ b/src/engine/platform/ym2610ext.h
@@ -25,12 +25,12 @@ class DivPlatformYM2610Ext: public DivPlatformYM2610 {
   struct OpChannel {
     DivMacroInt std;
     unsigned char freqH, freqL;
-    int freq, baseFreq, pitch, pitch2, ins;
+    int freq, baseFreq, pitch, pitch2, portaPauseFreq, ins;
     signed char konCycles;
     bool active, insChanged, freqChanged, keyOn, keyOff, portaPause;
     int vol;
     unsigned char pan;
-    OpChannel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), pitch2(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), vol(0), pan(3) {}
+    OpChannel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), pitch2(0), portaPauseFreq(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), vol(0), pan(3) {}
   };
   OpChannel opChan[4];
   bool isOpMuted[4];
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 224838e8..6a27dc65 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -268,26 +268,53 @@ void DivEngine::processRow(int i, bool afterDelay) {
   int whatRow=afterDelay?chan[i].delayRow:curRow;
   DivPattern* pat=song.pat[i].getPattern(song.orders.ord[i][whatOrder],false);
   // pre effects
-  if (!afterDelay) for (int j=0; j<song.pat[i].effectCols; j++) {
-    short effect=pat->data[whatRow][4+(j<<1)];
-    short effectVal=pat->data[whatRow][5+(j<<1)];
+  if (!afterDelay) {
+    bool returnAfterPre=false;
+    for (int j=0; j<song.pat[i].effectCols; j++) {
+      short effect=pat->data[whatRow][4+(j<<1)];
+      short effectVal=pat->data[whatRow][5+(j<<1)];
 
-    if (effectVal==-1) effectVal=0;
-    if (effect==0xed && effectVal!=0) {
-      if (effectVal<=nextSpeed) {
-        chan[i].rowDelay=effectVal+1;
-        chan[i].delayOrder=whatOrder;
-        chan[i].delayRow=whatRow;
-        if (effectVal==nextSpeed) {
-          //if (sysOfChan[i]!=DIV_SYSTEM_YM2610 && sysOfChan[i]!=DIV_SYSTEM_YM2610_EXT) chan[i].delayLocked=true;
-        } else {
-          chan[i].delayLocked=false;
-        }
-        return;
-      } else {
-        chan[i].delayLocked=false;
+      if (effectVal==-1) effectVal=0;
+
+      switch (effect) {
+        case 0x09: // speed 1
+          if (effectVal>0) speed1=effectVal;
+          break;
+        case 0x0f: // speed 2
+          if (effectVal>0) speed2=effectVal;
+          break;
+        case 0x0b: // change order
+          if (changeOrd==-1) {
+            changeOrd=effectVal;
+            changePos=0;
+          }
+          break;
+        case 0x0d: // next order
+          if (changeOrd<0 && (curOrder<(song.ordersLen-1) || !song.ignoreJumpAtEnd)) {
+            changeOrd=-2;
+            changePos=effectVal;
+          }
+          break;
+        case 0xed: // delay
+          if (effectVal!=0) {
+            if (effectVal<=nextSpeed) {
+              chan[i].rowDelay=effectVal+1;
+              chan[i].delayOrder=whatOrder;
+              chan[i].delayRow=whatRow;
+              if (effectVal==nextSpeed) {
+                //if (sysOfChan[i]!=DIV_SYSTEM_YM2610 && sysOfChan[i]!=DIV_SYSTEM_YM2610_EXT) chan[i].delayLocked=true;
+              } else {
+                chan[i].delayLocked=false;
+              }
+              returnAfterPre=true;
+            } else {
+              chan[i].delayLocked=false;
+            }
+          }
+          break;
       }
     }
+    if (returnAfterPre) return;
   }
 
   if (chan[i].delayLocked) return;
@@ -386,24 +413,6 @@ void DivEngine::processRow(int i, bool afterDelay) {
 
     // per-system effect
     if (!perSystemEffect(i,effect,effectVal)) switch (effect) {
-      case 0x09: // speed 1
-        if (effectVal>0) speed1=effectVal;
-        break;
-      case 0x0f: // speed 2
-        if (effectVal>0) speed2=effectVal;
-        break;
-      case 0x0b: // change order
-        if (changeOrd==-1) {
-          changeOrd=effectVal;
-          changePos=0;
-        }
-        break;
-      case 0x0d: // next order
-        if (changeOrd<0 && (curOrder<(song.ordersLen-1) || !song.ignoreJumpAtEnd)) {
-          changeOrd=-2;
-          changePos=effectVal;
-        }
-        break;
       case 0x08: // panning (split 4-bit)
         chan[i].panL=(effectVal>>4)|(effectVal&0xf0);
         chan[i].panR=(effectVal&15)|((effectVal&15)<<4);
@@ -631,7 +640,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
         chan[i].scheduledSlideReset=false;
         chan[i].inPorta=false;
         if (!song.arpNonPorta) dispatchCmd(DivCommand(DIV_CMD_PRE_PORTA,i,true,0));
-        dispatchCmd(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed,chan[i].portaNote));
+        dispatchCmd(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed*(song.linearPitch==2?song.pitchSlideSpeed:1),chan[i].portaNote));
         chan[i].portaNote=-1;
         chan[i].portaSpeed=-1;
         chan[i].inPorta=false;
@@ -954,7 +963,7 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
         }
         if (!song.noSlidesOnFirstTick || !firstTick) {
           if ((chan[i].keyOn || chan[i].keyOff) && chan[i].portaSpeed>0) {
-            if (dispatchCmd(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed,chan[i].portaNote))==2 && chan[i].portaStop && song.targetResetsSlides) {
+            if (dispatchCmd(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed*(song.linearPitch==2?song.pitchSlideSpeed:1),chan[i].portaNote))==2 && chan[i].portaStop && song.targetResetsSlides) {
               chan[i].portaSpeed=0;
               chan[i].oldNote=chan[i].note;
               chan[i].note=chan[i].portaNote;
diff --git a/src/engine/song.h b/src/engine/song.h
index 7b823a8b..d8a37cbb 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -301,7 +301,12 @@ struct DivSong {
 
   // compatibility flags
   bool limitSlides;
-  bool linearPitch;
+  // linear pitch
+  // 0: not linear
+  // 1: only pitch changes (04xy/E5xx) linear
+  // 2: full linear
+  unsigned char linearPitch;
+  unsigned char pitchSlideSpeed;
   // loop behavior
   // 0: reset on loop
   // 1: fake reset on loop
@@ -371,7 +376,6 @@ struct DivSong {
    */
   void clearSamples();
 
-
   /**
    * unloads the song, freeing all memory associated with it.
    * use before destroying the object.
@@ -412,7 +416,8 @@ struct DivSong {
     masterVol(1.0f),
     tuning(440.0f),
     limitSlides(false),
-    linearPitch(true),
+    linearPitch(2),
+    pitchSlideSpeed(4),
     loopModality(0),
     properNoiseLayout(false),
     waveDutyIsVol(false),
diff --git a/src/engine/sysDef.cpp b/src/engine/sysDef.cpp
index c5664840..93478989 100644
--- a/src/engine/sysDef.cpp
+++ b/src/engine/sysDef.cpp
@@ -1259,11 +1259,14 @@ void DivEngine::registerSystems() {
   );
 
   sysDefs[DIV_SYSTEM_OPN]=new DivSysDef(
-    "Yamaha YM2203 (OPN)", NULL, 0x8d, 0, 6, true, false, 0, false,
+    "Yamaha YM2203 (OPN)", NULL, 0x8d, 0, 6, true, false, 0x151, false,
     {"FM 1", "FM 2", "FM 3", "PSG 1", "PSG 2", "PSG 3"},
     {"F1", "F2", "F3", "S1", "S2", "S3"},
     {DIV_CH_FM, DIV_CH_FM, DIV_CH_FM, DIV_CH_PULSE, DIV_CH_PULSE, DIV_CH_PULSE},
-    {DIV_INS_FM, DIV_INS_FM, DIV_INS_FM, DIV_INS_AY, DIV_INS_AY, DIV_INS_AY}
+    {DIV_INS_FM, DIV_INS_FM, DIV_INS_FM, DIV_INS_AY, DIV_INS_AY, DIV_INS_AY},
+    {},
+    fmHardResetEffectHandler,
+    fmPostEffectHandler
   );
 
   sysDefs[DIV_SYSTEM_PC98]=new DivSysDef(
@@ -1459,11 +1462,13 @@ void DivEngine::registerSystems() {
   );
 
   sysDefs[DIV_SYSTEM_SCC]=new DivSysDef(
-    "Konami SCC", NULL, 0xa1, 0, 5, false, true, 0, false,
+    "Konami SCC", NULL, 0xa1, 0, 5, false, true, 0x161, false,
     {"Channel 1", "Channel 2", "Channel 3", "Channel 4", "Channel 5"},
     {"CH1", "CH2", "CH3", "CH4", "CH5"},
     {DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE},
-    {DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC}
+    {DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC},
+    {},
+    waveOnlyEffectHandler
   );
 
   auto oplDrumsEffectHandler=[this](int ch, unsigned char effect, unsigned char effectVal) -> bool {
@@ -1740,11 +1745,13 @@ void DivEngine::registerSystems() {
   );
 
   sysDefs[DIV_SYSTEM_SCC_PLUS]=new DivSysDef(
-    "Konami SCC+", NULL, 0xb4, 0, 5, false, true, 0, false,
+    "Konami SCC+", NULL, 0xb4, 0, 5, false, true, 0x161, false,
     {"Channel 1", "Channel 2", "Channel 3", "Channel 4", "Channel 5"},
     {"CH1", "CH2", "CH3", "CH4", "CH5"},
     {DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE, DIV_CH_WAVE},
-    {DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC}
+    {DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC, DIV_INS_SCC},
+    {},
+    waveOnlyEffectHandler
   );
 
   sysDefs[DIV_SYSTEM_SOUND_UNIT]=new DivSysDef(
diff --git a/src/engine/vgmOps.cpp b/src/engine/vgmOps.cpp
index 53800a52..53eddc1b 100644
--- a/src/engine/vgmOps.cpp
+++ b/src/engine/vgmOps.cpp
@@ -530,6 +530,11 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
           break;
       }
       break;
+    case DIV_SYSTEM_OPN:
+      w->writeC(5|baseAddr1);
+      w->writeC(write.addr&0xff);
+      w->writeC(write.val);
+      break;
     case DIV_SYSTEM_OPLL:
     case DIV_SYSTEM_OPLL_DRUMS:
     case DIV_SYSTEM_VRC7:
@@ -598,6 +603,71 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
           break;
       }
       break;
+    case DIV_SYSTEM_SCC:
+      if (write.addr<0x80) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|0);
+        w->writeC(write.addr&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0x8a) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|1);
+        w->writeC((write.addr-0x80)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0x8f) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|2);
+        w->writeC((write.addr-0x8a)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0x90) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|3);
+        w->writeC((write.addr-0x8f)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr>=0xe0) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|5);
+        w->writeC((write.addr-0xe0)&0x7f);
+        w->writeC(write.val&0xff);
+      } else {
+        logW("SCC: writing to unmapped address %.2x!",write.addr);
+      }
+      break;
+    case DIV_SYSTEM_SCC_PLUS:
+      if (write.addr<0x80) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|0);
+        w->writeC(write.addr&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0xa0) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|4);
+        w->writeC(write.addr);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0xaa) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|1);
+        w->writeC((write.addr-0xa0)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0xaf) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|2);
+        w->writeC((write.addr-0xaa)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr<0xb0) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|3);
+        w->writeC((write.addr-0xaf)&0x7f);
+        w->writeC(write.val&0xff);
+      } else if (write.addr>=0xe0) {
+        w->writeC(0xd2);
+        w->writeC(baseAddr2|5);
+        w->writeC((write.addr-0xe0)&0x7f);
+        w->writeC(write.val&0xff);
+      } else {
+        logW("SCC+: writing to unmapped address %.2x!",write.addr);
+      }
+      break;
     default:
       logW("write not handled!");
       break;
@@ -884,6 +954,18 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version) {
           howManyChips++;
         }
         break;
+      case DIV_SYSTEM_OPN:
+        if (!hasOPN) {
+          hasOPN=disCont[i].dispatch->chipClock;
+          willExport[i]=true;
+          writeDACSamples=true;
+        } else if (!(hasOPN&0x40000000)) {
+          isSecond[i]=true;
+          willExport[i]=true;
+          hasOPN|=0x40000000;
+          howManyChips++;
+        }
+        break;
       case DIV_SYSTEM_OPLL:
       case DIV_SYSTEM_OPLL_DRUMS:
       case DIV_SYSTEM_VRC7:
@@ -988,6 +1070,24 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version) {
           howManyChips++;
         }
         break;
+      case DIV_SYSTEM_SCC:
+      case DIV_SYSTEM_SCC_PLUS:
+        if (!hasK051649) {
+          hasK051649=disCont[i].dispatch->chipClock;
+          if (song.system[i]==DIV_SYSTEM_SCC_PLUS) {
+            hasK051649|=0x80000000;
+          }
+          willExport[i]=true;
+        } else if (!(hasK051649&0x40000000)) {
+          isSecond[i]=true;
+          willExport[i]=true;
+          hasK051649|=0x40000000;
+          if (song.system[i]==DIV_SYSTEM_SCC_PLUS) {
+            hasK051649|=0x80000000;
+          }
+          howManyChips++;
+        }
+        break;
       default:
         break;
     }
diff --git a/src/gui/compatFlags.cpp b/src/gui/compatFlags.cpp
index 52f46502..461048d6 100644
--- a/src/gui/compatFlags.cpp
+++ b/src/gui/compatFlags.cpp
@@ -18,6 +18,8 @@
  */
 
 #include "gui.h"
+#include "imgui.h"
+#include "intConst.h"
 
 void FurnaceGUI::drawCompatFlags() {
   if (nextWindow==GUI_WINDOW_COMPAT_FLAGS) {
@@ -32,10 +34,6 @@ void FurnaceGUI::drawCompatFlags() {
     if (ImGui::IsItemHovered()) {
       ImGui::SetTooltip("when enabled, slides are limited to a compatible range.\nmay cause problems with slides in negative octaves.");
     }
-    ImGui::Checkbox("Linear pitch control",&e->song.linearPitch);
-    if (ImGui::IsItemHovered()) {
-      ImGui::SetTooltip("linear pitch:\n- slides work in frequency/period space\n- E5xx and 04xx effects work in tonality space\nnon-linear pitch:\n- slides work in frequency/period space\n- E5xx and 04xx effects work on frequency/period space");
-    }
     ImGui::Checkbox("Proper noise layout on NES and PC Engine",&e->song.properNoiseLayout);
     if (ImGui::IsItemHovered()) {
       ImGui::SetTooltip("use a proper noise channel note mapping (0-15) instead of a rather unusual compatible one.\nunlocks all noise frequencies on PC Engine.");
@@ -126,6 +124,35 @@ void FurnaceGUI::drawCompatFlags() {
       ImGui::SetTooltip("when enabled, the pitch macro of an instrument is in linear space.");
     }
 
+    ImGui::Text("Pitch linearity:");
+    if (ImGui::RadioButton("None",e->song.linearPitch==0)) {
+      e->song.linearPitch=0;
+    }
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("like ProTracker/FamiTracker");
+    }
+    if (ImGui::RadioButton("Partial (only 04xy/E5xx)",e->song.linearPitch==1)) {
+      e->song.linearPitch=1;
+    }
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("like DefleMask");
+    }
+    if (ImGui::RadioButton("Full",e->song.linearPitch==2)) {
+      e->song.linearPitch=2;
+    }
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("like Impulse Tracker");
+    }
+
+    if (e->song.linearPitch==2) {
+      ImGui::SameLine();
+      ImGui::SetNextItemWidth(120.0f*dpiScale);
+      if (ImGui::InputScalar("Pitch slide speed multiplier",ImGuiDataType_U8,&e->song.pitchSlideSpeed,&_ONE,&_ONE)) {
+        if (e->song.pitchSlideSpeed<1) e->song.pitchSlideSpeed=1;
+        if (e->song.pitchSlideSpeed>64) e->song.pitchSlideSpeed=64;
+      }
+    }
+
     ImGui::Text("Loop modality:");
     if (ImGui::RadioButton("Reset channels",e->song.loopModality==0)) {
       e->song.loopModality=0;
diff --git a/src/gui/dataList.cpp b/src/gui/dataList.cpp
index 0de55205..0df3015a 100644
--- a/src/gui/dataList.cpp
+++ b/src/gui/dataList.cpp
@@ -47,7 +47,20 @@ void FurnaceGUI::drawInsList() {
     }
     ImGui::SameLine();
     if (ImGui::Button(ICON_FA_FOLDER_OPEN "##InsLoad")) {
-      doAction((settings.insLoadAlwaysReplace && curIns>=0 && curIns<(int)e->song.ins.size())?GUI_ACTION_INS_LIST_OPEN_REPLACE:GUI_ACTION_INS_LIST_OPEN);
+      doAction(GUI_ACTION_INS_LIST_OPEN);
+    }
+    if (ImGui::BeginPopupContextItem("InsOpenOpt")) {
+      if (ImGui::MenuItem("replace...")) {
+        doAction((curIns>=0 && curIns<(int)e->song.ins.size())?GUI_ACTION_INS_LIST_OPEN_REPLACE:GUI_ACTION_INS_LIST_OPEN);
+      }
+      ImGui::Separator();
+      if (ImGui::MenuItem("load from TX81Z")) {
+        doAction(GUI_ACTION_TX81Z_REQUEST);
+      }
+      ImGui::EndPopup();
+    }
+    if (ImGui::IsItemHovered()) {
+      ImGui::SetTooltip("Open (insert; right-click to replace)");
     }
     ImGui::SameLine();
     if (ImGui::Button(ICON_FA_FLOPPY_O "##InsSave")) {
diff --git a/src/gui/doAction.cpp b/src/gui/doAction.cpp
index d966b797..2e1dd377 100644
--- a/src/gui/doAction.cpp
+++ b/src/gui/doAction.cpp
@@ -25,6 +25,11 @@
 #include "actionUtil.h"
 #include "sampleUtil.h"
 
+const unsigned char avRequest[15]={
+  0xf0, 0x43, 0x20, 0x7e, 0x4c, 0x4d, 0x20, 0x20, 0x38, 0x39, 0x37, 0x36, 0x41, 0x45, 0xf7
+};
+
+
 void FurnaceGUI::doAction(int what) {
   switch (what) {
     case GUI_ACTION_OPEN:
@@ -141,6 +146,17 @@ void FurnaceGUI::doAction(int what) {
       fullScreen=!fullScreen;
       SDL_SetWindowFullscreen(sdlWin,fullScreen?(SDL_WINDOW_FULLSCREEN|SDL_WINDOW_FULLSCREEN_DESKTOP):0);
       break;
+    case GUI_ACTION_TX81Z_REQUEST: {
+      TAMidiMessage msg;
+      msg.type=TA_MIDI_SYSEX;
+      msg.sysExData.reset(new unsigned char[15]);
+      msg.sysExLen=15;
+      memcpy(msg.sysExData.get(),avRequest,15);
+      if (!e->sendMidiMessage(msg)) {
+        showError("Error while sending request (MIDI output not configured?)");
+      }
+      break;
+    }
     case GUI_ACTION_PANIC:
       e->syncReset();
       break;
@@ -1251,4 +1267,4 @@ void FurnaceGUI::doAction(int what) {
       setOrder(curOrder);
       break;
   }
-}
\ No newline at end of file
+}
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 327f65ff..f7795504 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -59,7 +59,7 @@ extern "C" {
 #define BACKUP_FUR "/backup.fur"
 #endif
 
-#ifdef ANDROID
+#ifdef IS_MOBILE
 #define MOBILE_UI_DEFAULT true
 #else
 #define MOBILE_UI_DEFAULT false
@@ -2469,6 +2469,15 @@ bool FurnaceGUI::loop() {
 
     wantCaptureKeyboard=ImGui::GetIO().WantTextInput;
 
+    if (wantCaptureKeyboard!=oldWantCaptureKeyboard) {
+      oldWantCaptureKeyboard=wantCaptureKeyboard;
+      if (wantCaptureKeyboard) {
+        SDL_StartTextInput();
+      } else {
+        SDL_StopTextInput();
+      }
+    }
+
     if (wantCaptureKeyboard) {
       WAKE_UP;
     }
@@ -2791,9 +2800,11 @@ bool FurnaceGUI::loop() {
       ImGui::EndMenu();
     }
     if (ImGui::BeginMenu("settings")) {
+#ifndef IS_MOBILE
       if (ImGui::MenuItem("full screen",BIND_FOR(GUI_ACTION_FULLSCREEN),fullScreen)) {
         doAction(GUI_ACTION_FULLSCREEN);
       }
+#endif
       if (ImGui::MenuItem("lock layout",NULL,lockLayout)) {
         lockLayout=!lockLayout;
       }
@@ -3673,7 +3684,11 @@ bool FurnaceGUI::init() {
   tempoView=e->getConfBool("tempoView",true);
   waveHex=e->getConfBool("waveHex",false);
   lockLayout=e->getConfBool("lockLayout",false);
+#ifdef IS_MOBILE
+  fullScreen=true;
+#else
   fullScreen=e->getConfBool("fullScreen",false);
+#endif
   mobileUI=e->getConfBool("mobileUI",MOBILE_UI_DEFAULT);
 
   syncSettings();
@@ -3695,6 +3710,7 @@ bool FurnaceGUI::init() {
 #endif
 
   SDL_SetHint("SDL_HINT_VIDEO_ALLOW_SCREENSAVER","1");
+  SDL_SetHint("SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH","1");
 
   SDL_Init(SDL_INIT_VIDEO);
 
@@ -3886,6 +3902,7 @@ FurnaceGUI::FurnaceGUI():
   displayExporting(false),
   vgmExportLoop(true),
   wantCaptureKeyboard(false),
+  oldWantCaptureKeyboard(false),
   displayMacroMenu(false),
   displayNew(false),
   fullScreen(false),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index e0b31a3b..e02a065c 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -306,6 +306,7 @@ enum FurnaceGUIActions {
   GUI_ACTION_FOLLOW_ORDERS,
   GUI_ACTION_FOLLOW_PATTERN,
   GUI_ACTION_FULLSCREEN,
+  GUI_ACTION_TX81Z_REQUEST,
   GUI_ACTION_PANIC,
 
   GUI_ACTION_WINDOW_EDIT_CONTROLS,
@@ -768,7 +769,7 @@ class FurnaceGUI {
   String mmlString[17];
   String mmlStringW;
 
-  bool quit, warnQuit, willCommit, edit, modified, displayError, displayExporting, vgmExportLoop, wantCaptureKeyboard, displayMacroMenu;
+  bool quit, warnQuit, willCommit, edit, modified, displayError, displayExporting, vgmExportLoop, wantCaptureKeyboard, oldWantCaptureKeyboard, displayMacroMenu;
   bool displayNew, fullScreen, preserveChanPos;
   bool willExport[32];
   int vgmExportVersion;
@@ -887,7 +888,6 @@ class FurnaceGUI {
     int eventDelay;
     int moveWindowTitle;
     int hiddenSystems;
-    int insLoadAlwaysReplace;
     int horizontalDataView;
     int noMultiSystem;
     unsigned int maxUndoSteps;
@@ -970,9 +970,8 @@ class FurnaceGUI {
       powerSave(1),
       absorbInsInput(0),
       eventDelay(0),
-      moveWindowTitle(0),
+      moveWindowTitle(1),
       hiddenSystems(0),
-      insLoadAlwaysReplace(1),
       horizontalDataView(0),
       noMultiSystem(0),
       maxUndoSteps(100),
diff --git a/src/gui/guiConst.cpp b/src/gui/guiConst.cpp
index 3cbd8204..4ea2de0c 100644
--- a/src/gui/guiConst.cpp
+++ b/src/gui/guiConst.cpp
@@ -459,6 +459,7 @@ const FurnaceGUIActionDef guiActions[GUI_ACTION_MAX]={
   D("FOLLOW_ORDERS", "Follow orders", 0),
   D("FOLLOW_PATTERN", "Follow pattern", 0),
   D("FULLSCREEN", "Toggle full-screen", SDLK_F11),
+  D("TX81Z_REQUEST", "Request voice from TX81Z", 0),
   D("PANIC", "Panic", SDLK_F12),
 
   D("WINDOW_EDIT_CONTROLS", "Edit Controls", 0),
@@ -833,6 +834,8 @@ const int availableSystems[]={
   DIV_SYSTEM_YMU759,
   DIV_SYSTEM_DUMMY,
   DIV_SYSTEM_SOUND_UNIT,
+  DIV_SYSTEM_OPN,
+  DIV_SYSTEM_PC98,
   DIV_SYSTEM_OPLL,
   DIV_SYSTEM_OPLL_DRUMS,
   DIV_SYSTEM_VRC7,
@@ -858,6 +861,8 @@ const int availableSystems[]={
   DIV_SYSTEM_VRC6,
   DIV_SYSTEM_FDS,
   DIV_SYSTEM_MMC5,
+  DIV_SYSTEM_SCC,
+  DIV_SYSTEM_SCC_PLUS,
   0 // don't remove this last one!
 };
 
diff --git a/src/gui/insEdit.cpp b/src/gui/insEdit.cpp
index a1b78bd1..82b47fb6 100644
--- a/src/gui/insEdit.cpp
+++ b/src/gui/insEdit.cpp
@@ -27,10 +27,6 @@
 #include <imgui.h>
 #include "plot_nolerp.h"
 
-const unsigned char avRequest[15]={
-  0xf0, 0x43, 0x20, 0x7e, 0x4c, 0x4d, 0x20, 0x20, 0x38, 0x39, 0x37, 0x36, 0x41, 0x45, 0xf7
-};
-
 const char* ssgEnvTypes[8]={
   "Down Down Down", "Down.", "Down Up Down Up", "Down UP", "Up Up Up", "Up.", "Up Down Up Down", "Up DOWN"
 };
@@ -1364,7 +1360,6 @@ void FurnaceGUI::drawInsEdit() {
 
         ImGui::TableNextRow();
         ImGui::TableNextColumn();
-        // TODO: load replace
         if (ImGui::Button(ICON_FA_FOLDER_OPEN "##IELoad")) {
           doAction(GUI_ACTION_INS_LIST_OPEN_REPLACE);
         }
@@ -1477,14 +1472,7 @@ void FurnaceGUI::drawInsEdit() {
                   ImGui::TableNextColumn();
                   drawAlgorithm(ins->fm.alg,FM_ALGS_4OP,ImVec2(ImGui::GetContentRegionAvail().x,48.0*dpiScale));
                   if (ImGui::Button("Request from TX81Z")) {
-                    TAMidiMessage msg;
-                    msg.type=TA_MIDI_SYSEX;
-                    msg.sysExData.reset(new unsigned char[15]);
-                    msg.sysExLen=15;
-                    memcpy(msg.sysExData.get(),avRequest,15);
-                    if (!e->sendMidiMessage(msg)) {
-                      showError("Error while sending request (MIDI output not configured?)");
-                    }
+                    doAction(GUI_ACTION_TX81Z_REQUEST);
                   }
                   ImGui::SameLine();
                   if (ImGui::Button("Send to TX81Z")) {
diff --git a/src/gui/presets.cpp b/src/gui/presets.cpp
index 3dd24e0a..dd003803 100644
--- a/src/gui/presets.cpp
+++ b/src/gui/presets.cpp
@@ -425,6 +425,26 @@ void FurnaceGUI::initSystemPresets() {
       0
     }
   ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "MSX + SCC", {
+      DIV_SYSTEM_AY8910, 64, 0, 16,
+      DIV_SYSTEM_SCC, 64, 0, 0,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "MSX + SCC+", {
+      DIV_SYSTEM_AY8910, 64, 0, 16,
+      DIV_SYSTEM_SCC_PLUS, 64, 0, 0,
+      0
+    }
+  ));
+  cat.systems.push_back(FurnaceGUISysDef(
+    "NEC PC-98 (with PC-9801-26K)", {
+      DIV_SYSTEM_OPN, 64, 0, 3,
+      0
+    }
+  ));
   cat.systems.push_back(FurnaceGUISysDef(
     "ZX Spectrum (48K)", {
       DIV_SYSTEM_AY8910, 64, 0, 2,
@@ -585,7 +605,7 @@ void FurnaceGUI::initSystemPresets() {
   cat.systems.push_back(FurnaceGUISysDef(
     "Commander X16", {
       DIV_SYSTEM_VERA, 64, 0, 0,
-      DIV_SYSTEM_YM2151, 64, 0, 0,
+      DIV_SYSTEM_YM2151, 32, 0, 0,
       0
     }
   ));
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index c575f962..1c22755a 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -419,11 +419,6 @@ void FurnaceGUI::drawSettings() {
             settings.restartOnFlagChange=restartOnFlagChangeB;
           }
 
-          bool insLoadAlwaysReplaceB=settings.insLoadAlwaysReplace;
-          if (ImGui::Checkbox("Always replace currently selected instrument when loading from instrument list",&insLoadAlwaysReplaceB)) {
-            settings.insLoadAlwaysReplace=insLoadAlwaysReplaceB;
-          }
-
           bool sysFileDialogB=settings.sysFileDialog;
           if (ImGui::Checkbox("Use system file picker",&sysFileDialogB)) {
             settings.sysFileDialog=sysFileDialogB;
@@ -1850,9 +1845,8 @@ void FurnaceGUI::syncSettings() {
   settings.powerSave=e->getConfInt("powerSave",POWER_SAVE_DEFAULT);
   settings.absorbInsInput=e->getConfInt("absorbInsInput",0);
   settings.eventDelay=e->getConfInt("eventDelay",0);
-  settings.moveWindowTitle=e->getConfInt("moveWindowTitle",0);
+  settings.moveWindowTitle=e->getConfInt("moveWindowTitle",1);
   settings.hiddenSystems=e->getConfInt("hiddenSystems",0);
-  settings.insLoadAlwaysReplace=e->getConfInt("insLoadAlwaysReplace",1);
   settings.horizontalDataView=e->getConfInt("horizontalDataView",0);
   settings.noMultiSystem=e->getConfInt("noMultiSystem",0);
 
@@ -1925,7 +1919,6 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.eventDelay,0,1);
   clampSetting(settings.moveWindowTitle,0,1);
   clampSetting(settings.hiddenSystems,0,1);
-  clampSetting(settings.insLoadAlwaysReplace,0,1);
   clampSetting(settings.horizontalDataView,0,1);
   clampSetting(settings.noMultiSystem,0,1)
 
@@ -2039,7 +2032,6 @@ void FurnaceGUI::commitSettings() {
   e->setConf("moveWindowTitle",settings.moveWindowTitle);
   e->setConf("hiddenSystems",settings.hiddenSystems);
   e->setConf("initialSys",e->encodeSysDesc(settings.initialSys));
-  e->setConf("insLoadAlwaysReplace",settings.insLoadAlwaysReplace);
   e->setConf("horizontalDataView",settings.horizontalDataView);
   e->setConf("noMultiSystem",settings.noMultiSystem);
 
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 8005ee0d..9ac2e4bd 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -355,6 +355,21 @@ void FurnaceGUI::drawSysConf(int chan, DivSystem type, unsigned int& flags, bool
       }
       break;
     }
+    case DIV_SYSTEM_OPN: {
+      if (ImGui::RadioButton("NTSC (3.58MHz)",(flags&3)==0)) {
+        copyOfFlags=(flags&0x80000000)|0;
+      }
+      if (ImGui::RadioButton("PAL (3.54MHz)",(flags&3)==1)) {
+        copyOfFlags=(flags&0x80000000)|1;
+      }
+      if (ImGui::RadioButton("Arcade (4MHz)",(flags&3)==2)) {
+        copyOfFlags=(flags&0x80000000)|2;
+      }
+      if (ImGui::RadioButton("PC-9801-26K? TODO: CONFIRM (3MHz)",(flags&3)==3)) {
+        copyOfFlags=(flags&0x80000000)|3;
+      }
+      break;
+    }
     case DIV_SYSTEM_GB:
     case DIV_SYSTEM_SWAN:
     case DIV_SYSTEM_VERA:
@@ -367,6 +382,8 @@ void FurnaceGUI::drawSysConf(int chan, DivSystem type, unsigned int& flags, bool
     case DIV_SYSTEM_YM2610B_EXT:
     case DIV_SYSTEM_YMU759:
     case DIV_SYSTEM_PET:
+    case DIV_SYSTEM_SCC:
+    case DIV_SYSTEM_SCC_PLUS:
       ImGui::Text("nothing to configure");
       break;
     default: