diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52cef63c..b7b111f8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -354,6 +354,7 @@ src/engine/platform/c64.cpp
 src/engine/platform/arcade.cpp
 src/engine/platform/tx81z.cpp
 src/engine/platform/ym2203.cpp
+src/engine/platform/ym2203ext.cpp
 src/engine/platform/ym2608.cpp
 src/engine/platform/ym2610.cpp
 src/engine/platform/ym2610ext.cpp
diff --git a/src/engine/platform/ym2203ext.cpp b/src/engine/platform/ym2203ext.cpp
index 440dce6a..7948d51e 100644
--- a/src/engine/platform/ym2203ext.cpp
+++ b/src/engine/platform/ym2203ext.cpp
@@ -17,20 +17,20 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "ym2610bext.h"
+#include "ym2203ext.h"
 #include "../engine.h"
 #include <math.h>
 
 #include "ym2610shared.h"
 #include "fmshared_OPN.h"
 
-int DivPlatformYM2610BExt::dispatch(DivCommand c) {
+int DivPlatformYM2203Ext::dispatch(DivCommand c) {
   if (c.chan<2) {
-    return DivPlatformYM2610B::dispatch(c);
+    return DivPlatformYM2203::dispatch(c);
   }
   if (c.chan>5) {
     c.chan-=3;
-    return DivPlatformYM2610B::dispatch(c);
+    return DivPlatformYM2203::dispatch(c);
   }
   int ch=c.chan-2;
   int ordch=orderedOps[ch];
@@ -384,7 +384,7 @@ static int opChanOffsH[4]={
   0xad, 0xae, 0xac, 0xa6
 };
 
-void DivPlatformYM2610BExt::tick(bool sysTick) {
+void DivPlatformYM2203Ext::tick(bool sysTick) {
   if (extMode) {
     bool writeSomething=false;
     unsigned char writeMask=2;
@@ -401,7 +401,7 @@ void DivPlatformYM2610BExt::tick(bool sysTick) {
     }
   }
 
-  DivPlatformYM2610B::tick(sysTick);
+  DivPlatformYM2203::tick(sysTick);
 
   bool writeNoteOn=false;
   unsigned char writeMask=2;
@@ -438,13 +438,13 @@ void DivPlatformYM2610BExt::tick(bool sysTick) {
   }
 }
 
-void DivPlatformYM2610BExt::muteChannel(int ch, bool mute) {
+void DivPlatformYM2203Ext::muteChannel(int ch, bool mute) {
   if (ch<2) {
-    DivPlatformYM2610B::muteChannel(ch,mute);
+    DivPlatformYM2203::muteChannel(ch,mute);
     return;
   }
   if (ch>5) {
-    DivPlatformYM2610B::muteChannel(ch-3,mute);
+    DivPlatformYM2203::muteChannel(ch-3,mute);
     return;
   }
   isOpMuted[ch-2]=mute;
@@ -462,7 +462,7 @@ void DivPlatformYM2610BExt::muteChannel(int ch, bool mute) {
   }
 }
 
-void DivPlatformYM2610BExt::forceIns() {
+void DivPlatformYM2203Ext::forceIns() {
   for (int i=0; i<6; i++) {
     for (int j=0; j<4; j++) {
       unsigned short baseAddr=chanOffs[i]|opOffs[j];
@@ -494,7 +494,6 @@ void DivPlatformYM2610BExt::forceIns() {
       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;
@@ -518,23 +517,23 @@ void DivPlatformYM2610BExt::forceIns() {
   }
 }
 
-void* DivPlatformYM2610BExt::getChanState(int ch) {
+void* DivPlatformYM2203Ext::getChanState(int ch) {
   if (ch>=6) return &chan[ch-3];
   if (ch>=2) return &opChan[ch-2];
   return &chan[ch];
 }
 
-DivDispatchOscBuffer* DivPlatformYM2610BExt::getOscBuffer(int ch) {
+DivDispatchOscBuffer* DivPlatformYM2203Ext::getOscBuffer(int ch) {
   if (ch>=6) return oscBuf[ch-3];
   if (ch<3) return oscBuf[ch];
   return NULL;
 }
 
-void DivPlatformYM2610BExt::reset() {
-  DivPlatformYM2610B::reset();
+void DivPlatformYM2203Ext::reset() {
+  DivPlatformYM2203::reset();
 
   for (int i=0; i<4; i++) {
-    opChan[i]=DivPlatformYM2610BExt::OpChannel();
+    opChan[i]=DivPlatformYM2203Ext::OpChannel();
     opChan[i].vol=127;
   }
 
@@ -543,12 +542,12 @@ void DivPlatformYM2610BExt::reset() {
   extMode=true;
 }
 
-bool DivPlatformYM2610BExt::keyOffAffectsArp(int ch) {
+bool DivPlatformYM2203Ext::keyOffAffectsArp(int ch) {
   return (ch>8);
 }
 
-void DivPlatformYM2610BExt::notifyInsChange(int ins) {
-  DivPlatformYM2610B::notifyInsChange(ins);
+void DivPlatformYM2203Ext::notifyInsChange(int ins) {
+  DivPlatformYM2203::notifyInsChange(ins);
   for (int i=0; i<4; i++) {
     if (opChan[i].ins==ins) {
       opChan[i].insChanged=true;
@@ -556,8 +555,8 @@ void DivPlatformYM2610BExt::notifyInsChange(int ins) {
   }
 }
 
-int DivPlatformYM2610BExt::init(DivEngine* parent, int channels, int sugRate, unsigned int flags) {
-  DivPlatformYM2610B::init(parent,channels,sugRate,flags);
+int DivPlatformYM2203Ext::init(DivEngine* parent, int channels, int sugRate, unsigned int flags) {
+  DivPlatformYM2203::init(parent,channels,sugRate,flags);
   for (int i=0; i<4; i++) {
     isOpMuted[i]=false;
   }
@@ -566,9 +565,9 @@ int DivPlatformYM2610BExt::init(DivEngine* parent, int channels, int sugRate, un
   return 19;
 }
 
-void DivPlatformYM2610BExt::quit() {
-  DivPlatformYM2610B::quit();
+void DivPlatformYM2203Ext::quit() {
+  DivPlatformYM2203::quit();
 }
 
-DivPlatformYM2610BExt::~DivPlatformYM2610BExt() {
+DivPlatformYM2203Ext::~DivPlatformYM2203Ext() {
 }
diff --git a/src/engine/platform/ym2203ext.h b/src/engine/platform/ym2203ext.h
index 4e3f7c5f..7dde3abb 100644
--- a/src/engine/platform/ym2203ext.h
+++ b/src/engine/platform/ym2203ext.h
@@ -19,9 +19,9 @@
 
 #include "../dispatch.h"
 
-#include "ym2610b.h"
+#include "ym2203.h"
 
-class DivPlatformYM2610BExt: public DivPlatformYM2610B {
+class DivPlatformYM2203Ext: public DivPlatformYM2203 {
   struct OpChannel {
     DivMacroInt std;
     unsigned char freqH, freqL;
@@ -47,5 +47,5 @@ class DivPlatformYM2610BExt: public DivPlatformYM2610B {
     void notifyInsChange(int ins);
     int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
     void quit();
-    ~DivPlatformYM2610BExt();
+    ~DivPlatformYM2203Ext();
 };
diff --git a/src/engine/song.cpp b/src/engine/song.cpp
index 7a815eb1..4c142c5f 100644
--- a/src/engine/song.cpp
+++ b/src/engine/song.cpp
@@ -19,6 +19,8 @@
 
 #include "song.h"
 
+DivOrders emptyOrders;
+
 void DivSong::clearSongData() {
   for (int i=0; i<DIV_MAX_CHANS; i++) {
     pat[i].wipePatterns();
diff --git a/src/engine/song.h b/src/engine/song.h
index e4f00354..b89d56ad 100644
--- a/src/engine/song.h
+++ b/src/engine/song.h
@@ -110,6 +110,31 @@ enum DivSystem {
   DIV_SYSTEM_DUMMY
 };
 
+extern DivOrders emptyOrders;
+
+struct DivSubSong {
+  String name, notes;
+  unsigned char hilightA, hilightB;
+  unsigned char timeBase, speed1, speed2, arpLen;
+  bool pal;
+  bool customTempo;
+  float hz;
+  int patLen, ordersLen;
+
+  DivOrders orders;
+  DivChannelData pat[DIV_MAX_CHANS];
+
+  bool chanShow[DIV_MAX_CHANS];
+  unsigned char chanCollapse[DIV_MAX_CHANS];
+
+  DivSubSong() {
+    for (int i=0; i<DIV_MAX_CHANS; i++) {
+      chanShow[i]=true;
+      chanCollapse[i]=0;
+    }
+  }
+};
+
 struct DivSong {
   // version number used for saving the song.
   // Furnace will save using the latest possible version,
@@ -156,14 +181,21 @@ struct DivSong {
   //   - introduces Genesis system
   //   - introduces system number
   //   - patterns now stored in current known format
+  // - 8: ???
+  //   - only used in the Medivo YMU cover
   // - 7: ???
+  //   - only present in a later version of First.dmf
+  //   - pattern format changes: empty field is 0xFF instead of 0x80
+  //   - instrument now stored in pattern
   // - 5: BETA 3
   //   - adds arpeggio tick
   // - 4: BETA 2
+  //   - possibly adds instrument number (stored in channel)?
+  //   - cannot confirm as I don't have any version 4 modules
   // - 3: BETA 1
   //   - possibly the first version that could save
   //   - basic format, no system number, 16 instruments, one speed, YMU759-only
-  //   - patterns were stored in a different format (chars instead of shorts)
+  //   - patterns were stored in a different format (chars instead of shorts) and no instrument
   //   - if somebody manages to find a version 2 or even 1 module, please tell me as it will be worth more than a luxury vehicle
   unsigned short version;
   bool isDMF;
@@ -345,14 +377,16 @@ struct DivSong {
   bool snDutyReset;
   bool pitchMacroIsLinear;
 
-  DivOrders orders;
+  DivOrders* orders;
   std::vector<DivInstrument*> ins;
-  DivChannelData pat[DIV_MAX_CHANS];
+  DivChannelData* pat;
   std::vector<DivWavetable*> wave;
   std::vector<DivSample*> sample;
 
-  bool chanShow[DIV_MAX_CHANS];
-  unsigned char chanCollapse[DIV_MAX_CHANS];
+  std::vector<DivSubSong> subsongs;
+
+  bool* chanShow;
+  unsigned char* chanCollapse;
 
   DivInstrument nullIns, nullInsOPLL, nullInsOPL, nullInsQSound;
   DivWavetable nullWave;
@@ -457,10 +491,11 @@ struct DivSong {
       systemPan[i]=0;
       systemFlags[i]=0;
     }
-    for (int i=0; i<DIV_MAX_CHANS; i++) {
-      chanShow[i]=true;
-      chanCollapse[i]=0;
-    }
+    subsongs.push_back(DivSubSong());
+    chanShow=subsongs[0].chanShow;
+    chanCollapse=subsongs[0].chanCollapse;
+    orders=&subsongs[0].orders;
+    pat=subsongs[0].pat;
     system[0]=DIV_SYSTEM_YM2612;
     system[1]=DIV_SYSTEM_SMS;