diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0bbe826c..20e6cf507 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -489,6 +489,8 @@ extern/Nuked-PSG/ympsg.c
 extern/opm/opm.c
 extern/Nuked-OPLL/opll.c
 extern/opl/opl3.c
+extern/YM3812-LLE/fmopl2.c
+extern/YMF262-LLE/fmopl3.c
 
 src/pch.cpp
 
diff --git a/src/engine/dispatchContainer.cpp b/src/engine/dispatchContainer.cpp
index 4148c2a3e..878232ca0 100644
--- a/src/engine/dispatchContainer.cpp
+++ b/src/engine/dispatchContainer.cpp
@@ -427,34 +427,74 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
     case DIV_SYSTEM_OPL:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(1,false);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_OPL_DRUMS:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(1,true);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_OPL2:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(2,false);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_OPL2_DRUMS:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(2,true);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_OPL3:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(3,false);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl3CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl3Core",0));
+      }
       break;
     case DIV_SYSTEM_OPL3_DRUMS:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(3,true);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl3CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl3Core",0));
+      }
       break;
     case DIV_SYSTEM_Y8950:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(8950,false);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_Y8950_DRUMS:
       dispatch=new DivPlatformOPL;
       ((DivPlatformOPL*)dispatch)->setOPLType(8950,true);
+      if (isRender) {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2CoreRender",0));
+      } else {
+        ((DivPlatformOPL*)dispatch)->setCore(eng->getConfInt("opl2Core",0));
+      }
       break;
     case DIV_SYSTEM_OPZ:
       dispatch=new DivPlatformTX81Z;
diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index 52968a1a5..f505b7d8d 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -292,12 +292,252 @@ void DivPlatformOPL::acquire_nuked(short** buf, size_t len) {
   }
 }
 
+void DivPlatformOPL::acquire_ymfm1(short** buf, size_t len) {
+  ymfm::ymfm_output<1> out;
+
+  ymfm::ym3526::fm_engine* fme=fm_ymfm1->debug_fm_engine();
+  ymfm::fm_channel<ymfm::opl_registers_base<1>>* fmChan[9];
+
+  for (int i=0; i<9; i++) {
+    fmChan[i]=fme->debug_channel(i);
+  }
+
+  for (size_t h=0; h<len; h++) {
+    if (!writes.empty() && --delay<0) {
+      delay=1;
+      QueuedWrite& w=writes.front();
+
+      fm_ymfm1->write(0,w.addr);
+      fm_ymfm1->write(1,w.val);
+
+      regPool[w.addr&511]=w.val;
+      writes.pop();
+    }
+
+    fm_ymfm1->generate(&out,1);
+
+    buf[0][h]=out.data[0];
+
+    if (properDrums) {
+      for (int i=0; i<7; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+      oscBuf[7]->data[oscBuf[7]->needle++]=CLAMP(fmChan[7]->debug_special1()<<2,-32768,32767);
+      oscBuf[8]->data[oscBuf[8]->needle++]=CLAMP(fmChan[8]->debug_special1()<<2,-32768,32767);
+      oscBuf[9]->data[oscBuf[9]->needle++]=CLAMP(fmChan[8]->debug_special2()<<2,-32768,32767);
+      oscBuf[10]->data[oscBuf[10]->needle++]=CLAMP(fmChan[7]->debug_special2()<<2,-32768,32767);
+    } else {
+      for (int i=0; i<9; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+    }
+  }
+}
+
+void DivPlatformOPL::acquire_ymfm2(short** buf, size_t len) {
+  ymfm::ymfm_output<1> out;
+
+  ymfm::ym3812::fm_engine* fme=fm_ymfm2->debug_fm_engine();
+  ymfm::fm_channel<ymfm::opl_registers_base<2>>* fmChan[9];
+
+  for (int i=0; i<9; i++) {
+    fmChan[i]=fme->debug_channel(i);
+  }
+
+  for (size_t h=0; h<len; h++) {
+    if (!writes.empty() && --delay<0) {
+      delay=1;
+      QueuedWrite& w=writes.front();
+
+      fm_ymfm2->write(0,w.addr);
+      fm_ymfm2->write(1,w.val);
+
+      regPool[w.addr&511]=w.val;
+      writes.pop();
+    }
+
+    fm_ymfm2->generate(&out,1);
+
+    buf[0][h]=out.data[0];
+
+    if (properDrums) {
+      for (int i=0; i<7; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+      oscBuf[7]->data[oscBuf[7]->needle++]=CLAMP(fmChan[7]->debug_special1()<<2,-32768,32767);
+      oscBuf[8]->data[oscBuf[8]->needle++]=CLAMP(fmChan[8]->debug_special1()<<2,-32768,32767);
+      oscBuf[9]->data[oscBuf[9]->needle++]=CLAMP(fmChan[8]->debug_special2()<<2,-32768,32767);
+      oscBuf[10]->data[oscBuf[10]->needle++]=CLAMP(fmChan[7]->debug_special2()<<2,-32768,32767);
+    } else {
+      for (int i=0; i<9; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+    }
+  }
+}
+
+// TODO: ADPCM
+void DivPlatformOPL::acquire_ymfm8950(short** buf, size_t len) {
+  ymfm::ymfm_output<1> out;
+
+  ymfm::y8950::fm_engine* fme=fm_ymfm8950->debug_fm_engine();
+  ymfm::fm_channel<ymfm::opl_registers_base<1>>* fmChan[9];
+
+  for (int i=0; i<9; i++) {
+    fmChan[i]=fme->debug_channel(i);
+  }
+
+  for (size_t h=0; h<len; h++) {
+    if (!writes.empty() && --delay<0) {
+      delay=1;
+      QueuedWrite& w=writes.front();
+
+      fm_ymfm8950->write(0,w.addr);
+      fm_ymfm8950->write(1,w.val);
+
+      regPool[w.addr&511]=w.val;
+      writes.pop();
+    }
+
+    fm_ymfm8950->generate(&out,1);
+
+    buf[0][h]=out.data[0];
+
+    if (properDrums) {
+      for (int i=0; i<7; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+      oscBuf[7]->data[oscBuf[7]->needle++]=CLAMP(fmChan[7]->debug_special1()<<2,-32768,32767);
+      oscBuf[8]->data[oscBuf[8]->needle++]=CLAMP(fmChan[8]->debug_special1()<<2,-32768,32767);
+      oscBuf[9]->data[oscBuf[9]->needle++]=CLAMP(fmChan[8]->debug_special2()<<2,-32768,32767);
+      oscBuf[10]->data[oscBuf[10]->needle++]=CLAMP(fmChan[7]->debug_special2()<<2,-32768,32767);
+    } else {
+      for (int i=0; i<9; i++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(fmChan[i]->debug_output(0)<<2,-32768,32767);
+      }
+    }
+  }
+}
+
+void DivPlatformOPL::acquire_ymfm3(short** buf, size_t len) {
+  ymfm::ymfm_output<4> out;
+
+  ymfm::ymf262::fm_engine* fme=fm_ymfm3->debug_fm_engine();
+  ymfm::fm_channel<ymfm::opl_registers_base<3>>* fmChan[18];
+
+  for (int i=0; i<18; i++) {
+    fmChan[i]=fme->debug_channel(i);
+  }
+
+  for (size_t h=0; h<len; h++) {
+    if (!writes.empty() && --delay<0) {
+      delay=1;
+      QueuedWrite& w=writes.front();
+
+      fm_ymfm3->write((w.addr&0x100)?2:0,w.addr);
+      fm_ymfm3->write(1,w.val);
+
+      regPool[w.addr&511]=w.val;
+      writes.pop();
+    }
+
+    fm_ymfm3->generate(&out,1);
+
+    buf[0][h]=out.data[0]>>1;
+    if (totalOutputs>1) {
+      buf[1][h]=out.data[1]>>1;
+    }
+    if (totalOutputs>2) {
+      buf[2][h]=out.data[2]>>1;
+    }
+    if (totalOutputs>3) {
+      buf[3][h]=out.data[3]>>1;
+    }
+    if (totalOutputs==6) {
+      // placeholder for OPL4
+      buf[4][h]=0;
+      buf[5][h]=0;
+    }
+
+    // TODO: fix 4-op view
+    if (properDrums) {
+      for (int i=0; i<16; i++) {
+        unsigned char ch=outChanMap[i];
+        if (ch==255) continue;
+        int chOut=fmChan[ch]->debug_output(0);
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(1);
+        }
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(2);
+        }
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(3);
+        }
+        if (i==15) {
+          oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(chOut,-32768,32767);
+        } else {
+          oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(chOut<<1,-32768,32767);
+        }
+      }
+      oscBuf[16]->data[oscBuf[16]->needle++]=CLAMP(fmChan[7]->debug_special2()<<1,-32768,32767);
+      oscBuf[17]->data[oscBuf[17]->needle++]=CLAMP(fmChan[8]->debug_special1()<<1,-32768,32767);
+      oscBuf[18]->data[oscBuf[18]->needle++]=CLAMP(fmChan[8]->debug_special2()<<1,-32768,32767);
+      oscBuf[19]->data[oscBuf[19]->needle++]=CLAMP(fmChan[7]->debug_special1()<<1,-32768,32767);
+    } else {
+      for (int i=0; i<18; i++) {
+        unsigned char ch=outChanMap[i];
+        if (ch==255) continue;
+        int chOut=fmChan[ch]->debug_output(0);
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(1);
+        }
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(2);
+        }
+        if (chOut==0) {
+          chOut=fmChan[ch]->debug_output(3);
+        }
+        oscBuf[i]->data[oscBuf[i]->needle++]=CLAMP(chOut<<1,-32768,32767);
+      }
+    }
+  }
+}
+
+void DivPlatformOPL::acquire_nukedLLE2(short** buf, size_t len) {
+}
+
+void DivPlatformOPL::acquire_nukedLLE3(short** buf, size_t len) {
+}
+
 void DivPlatformOPL::acquire(short** buf, size_t len) {
-  //if (useYMFM) {
-  //  acquire_ymfm(buf,len);
-  //} else {
+  if (emuCore==2) { // LLE
+    switch (chipType) {
+      case 1: case 2: case 8950:
+        acquire_nukedLLE2(buf,len);
+        break;
+      case 3: case 759:
+        acquire_nukedLLE3(buf,len);
+        break;
+    }
+  } else if (emuCore==1) { // ymfm
+    switch (chipType) {
+      case 1:
+        acquire_ymfm1(buf,len);
+        break;
+      case 2:
+        acquire_ymfm2(buf,len);
+        break;
+      case 8950:
+        acquire_ymfm8950(buf,len);
+        break;
+      case 3: case 759:
+        acquire_ymfm3(buf,len);
+        break;
+    }
+  } else { // OPL3
     acquire_nuked(buf,len);
-  //}
+  }
 }
 
 double DivPlatformOPL::NOTE_ADPCMB(int note) {
@@ -1620,17 +1860,34 @@ int DivPlatformOPL::getRegisterPoolSize() {
 void DivPlatformOPL::reset() {
   while (!writes.empty()) writes.pop();
   memset(regPool,0,512);
-  /*
-  if (useYMFM) {
-    fm_ymfm->reset();
-  }
-  */
-  if (downsample) {
-    const unsigned int downsampledRate=(unsigned int)((double)rate*round(COLOR_NTSC/72.0)/(double)chipRateBase);
-    OPL3_Reset(&fm,downsampledRate);
+  
+  const unsigned int downsampledRate=(unsigned int)((double)rate*round(COLOR_NTSC/72.0)/(double)chipRateBase);
+  
+  if (emuCore==2) {
+    // TODO: LLE reset
+  } else if (emuCore==1) {
+    switch (chipType) {
+      case 1:
+        fm_ymfm1->reset();
+        break;
+      case 2:
+        fm_ymfm2->reset();
+        break;
+      case 8950:
+        fm_ymfm8950->reset();
+        break;
+      case 3: case 759:
+        fm_ymfm3->reset();
+        break;
+    }
   } else {
-    OPL3_Reset(&fm,rate);
+    if (downsample) {
+      OPL3_Reset(&fm,downsampledRate);
+    } else {
+      OPL3_Reset(&fm,rate);
+    }
   }
+
   if (dumpWrites) {
     addWrite(0xffffffff,0);
   }
@@ -1744,8 +2001,8 @@ int DivPlatformOPL::getPortaFloor(int ch) {
   return (ch>5)?12:0;
 }
 
-void DivPlatformOPL::setYMFM(bool use) {
-  useYMFM=use;
+void DivPlatformOPL::setCore(unsigned char which) {
+  emuCore=which;
 }
 
 void DivPlatformOPL::setOPLType(int type, bool drums) {
@@ -1891,11 +2148,13 @@ void DivPlatformOPL::setFlags(const DivConfig& flags) {
           totalOutputs=4;
           break;
       }
-      if (downsample) {
-        const unsigned int downsampledRate=(unsigned int)((double)rate*round(COLOR_NTSC/72.0)/(double)chipRateBase);
-        OPL3_Resample(&fm,downsampledRate);
-      } else {
-        OPL3_Resample(&fm,rate);
+      if (emuCore!=1 && emuCore!=2) {
+        if (downsample) {
+          const unsigned int downsampledRate=(unsigned int)((double)rate*round(COLOR_NTSC/72.0)/(double)chipRateBase);
+          OPL3_Resample(&fm,downsampledRate);
+        } else {
+          OPL3_Resample(&fm,rate);
+        }
       }
       break;
     case 4:
@@ -1990,6 +2249,29 @@ int DivPlatformOPL::init(DivEngine* p, int channels, int sugRate, const DivConfi
   for (int i=0; i<20; i++) {
     oscBuf[i]=new DivDispatchOscBuffer;
   }
+
+  fm_ymfm1=NULL;
+  fm_ymfm2=NULL;
+  fm_ymfm8950=NULL;
+  fm_ymfm3=NULL;
+
+  if (emuCore==1) {
+    switch (chipType) {
+      case 1:
+        fm_ymfm1=new ymfm::ym3526(iface);
+        break;
+      case 2:
+        fm_ymfm2=new ymfm::ym3812(iface);
+        break;
+      case 8950:
+        fm_ymfm8950=new ymfm::y8950(iface);
+        break;
+      case 3: case 759:
+        fm_ymfm3=new ymfm::ymf262(iface);
+        break;
+    }
+  }
+
   setFlags(flags);
 
   if (adpcmChan>=0) {
@@ -2012,6 +2294,22 @@ void DivPlatformOPL::quit() {
     delete adpcmB;
     delete[] adpcmBMem;
   }
+  if (fm_ymfm1!=NULL) {
+    delete fm_ymfm1;
+    fm_ymfm1=NULL;
+  }
+  if (fm_ymfm2!=NULL) {
+    delete fm_ymfm2;
+    fm_ymfm2=NULL;
+  }
+  if (fm_ymfm8950!=NULL) {
+    delete fm_ymfm8950;
+    fm_ymfm8950=NULL;
+  }
+  if (fm_ymfm3!=NULL) {
+    delete fm_ymfm3;
+    fm_ymfm3=NULL;
+  }
 }
 
 DivPlatformOPL::~DivPlatformOPL() {
diff --git a/src/engine/platform/opl.h b/src/engine/platform/opl.h
index 54cf0c24d..23fd7b97e 100644
--- a/src/engine/platform/opl.h
+++ b/src/engine/platform/opl.h
@@ -23,7 +23,12 @@
 #include "../dispatch.h"
 #include "../../fixedQueue.h"
 #include "../../../extern/opl/opl3.h"
+extern "C" {
+#include "../../../extern/YM3812-LLE/fmopl2.h"
+#include "../../../extern/YMF262-LLE/fmopl3.h"
+}
 #include "sound/ymfm/ymfm_adpcm.h"
+#include "sound/ymfm/ymfm_opl.h"
 
 class DivOPLAInterface: public ymfm::ymfm_interface {
   public:
@@ -68,7 +73,7 @@ class DivPlatformOPL: public DivDispatch {
       QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
     };
     FixedQueue<QueuedWrite,2048> writes;
-    opl3_chip fm;
+    
     unsigned char* adpcmBMem;
     size_t adpcmBMemLen;
     DivOPLAInterface iface;
@@ -93,11 +98,25 @@ class DivPlatformOPL: public DivDispatch {
 
     unsigned char lfoValue;
 
-    bool useYMFM, update4OpMask, pretendYMU, downsample, compatPan;
+    // 0: Nuked-OPL3
+    // 1: ymfm
+    // 2: YM3812-LLE/YMF262-LLE
+    unsigned char emuCore;
+
+    bool update4OpMask, pretendYMU, downsample, compatPan;
   
     short oldWrites[512];
     short pendingWrites[512];
 
+    // chips
+    opl3_chip fm;
+    ymfm::ym3526* fm_ymfm1;
+    ymfm::ym3812* fm_ymfm2;
+    ymfm::y8950* fm_ymfm8950;
+    ymfm::ymf262* fm_ymfm3;
+    fmopl2_t fm_lle2;
+    fmopl3_t fm_lle3;
+
     int octave(int freq);
     int toFreq(int freq);
     double NOTE_ADPCMB(int note);
@@ -106,8 +125,13 @@ class DivPlatformOPL: public DivDispatch {
     friend void putDispatchChip(void*,int);
     friend void putDispatchChan(void*,int,int);
 
+    void acquire_nukedLLE2(short** buf, size_t len);
+    void acquire_nukedLLE3(short** buf, size_t len);
     void acquire_nuked(short** buf, size_t len);
-    //void acquire_ymfm(short** buf, size_t len);
+    void acquire_ymfm3(short** buf, size_t len);
+    void acquire_ymfm8950(short** buf, size_t len);
+    void acquire_ymfm2(short** buf, size_t len);
+    void acquire_ymfm1(short** buf, size_t len);
   
   public:
     void acquire(short** buf, size_t len);
@@ -124,7 +148,7 @@ class DivPlatformOPL: public DivDispatch {
     void tick(bool sysTick=true);
     void muteChannel(int ch, bool mute);
     int getOutputCount();
-    void setYMFM(bool use);
+    void setCore(unsigned char which);
     void setOPLType(int type, bool drums);
     bool keyOffAffectsArp(int ch);
     bool keyOffAffectsPorta(int ch);
diff --git a/src/engine/platform/sound/ymfm/ymfm_fm.h b/src/engine/platform/sound/ymfm/ymfm_fm.h
index df3b486af..3ac36b50d 100644
--- a/src/engine/platform/sound/ymfm/ymfm_fm.h
+++ b/src/engine/platform/sound/ymfm/ymfm_fm.h
@@ -305,6 +305,8 @@ public:
 	// simple getters for debugging
 	fm_operator<RegisterType> *debug_operator(uint32_t index) const { return m_op[index]; }
   int32_t debug_output(uint32_t index) const { return m_output[index]; }
+  int32_t debug_special1() const { return m_special1; }
+  int32_t debug_special2() const { return m_special2; }
 
 private:
 	// helper to add values to the outputs based on channel enables
@@ -343,6 +345,8 @@ private:
 	RegisterType &m_regs;                  // direct reference to registers
 	fm_engine_base<RegisterType> &m_owner; // reference to the owning engine
   mutable int32_t m_output[4];
+  mutable int32_t m_special1;
+  mutable int32_t m_special2;
 };
 
 
diff --git a/src/engine/platform/sound/ymfm/ymfm_fm.ipp b/src/engine/platform/sound/ymfm/ymfm_fm.ipp
index 81b351fe9..7a37ec8a3 100644
--- a/src/engine/platform/sound/ymfm/ymfm_fm.ipp
+++ b/src/engine/platform/sound/ymfm/ymfm_fm.ipp
@@ -808,7 +808,9 @@ fm_channel<RegisterType>::fm_channel(fm_engine_base<RegisterType> &owner, uint32
 	m_op{ nullptr, nullptr, nullptr, nullptr },
 	m_regs(owner.regs()),
 	m_owner(owner),
-  m_output{ 0, 0, 0, 0 }
+  m_output{ 0, 0, 0, 0 },
+        m_special1(0),
+        m_special2(0)
 {
 }
 
@@ -1139,13 +1141,13 @@ void fm_channel<RegisterType>::output_rhythm_ch7(uint32_t phase_select, output_d
 	// and a combination of noise and the operator 13/17 phase select
 	// to compute the phase
 	uint32_t phase = (phase_select << 9) | (0xd0 >> (2 * (noise_state ^ phase_select)));
-	int32_t result = m_op[0]->compute_volume(phase, am_offset) >> rshift;
+	int32_t result = m_special1 = m_op[0]->compute_volume(phase, am_offset) >> rshift;
 
 	// Snare Drum: this uses the envelope from operator 16 (channel 7),
 	// and a combination of noise and operator 13 phase to pick a phase
 	uint32_t op13phase = m_op[0]->phase();
 	phase = (0x100 << bitfield(op13phase, 8)) ^ (noise_state << 8);
-	result += m_op[1]->compute_volume(phase, am_offset) >> rshift;
+	result += m_special2 = m_op[1]->compute_volume(phase, am_offset) >> rshift;
 	result = clamp(result, -clipmax - 1, clipmax);
 
 	// add to the output
@@ -1166,12 +1168,12 @@ void fm_channel<RegisterType>::output_rhythm_ch8(uint32_t phase_select, output_d
 	uint32_t am_offset = m_regs.lfo_am_offset(m_choffs);
 
 	// Tom Tom: this is just a single operator processed normally
-	int32_t result = m_op[0]->compute_volume(m_op[0]->phase(), am_offset) >> rshift;
+	int32_t result = m_special1 = m_op[0]->compute_volume(m_op[0]->phase(), am_offset) >> rshift;
 
 	// Top Cymbal: this uses the envelope from operator 17 (channel 8),
 	// and the operator 13/17 phase select to compute the phase
 	uint32_t phase = 0x100 | (phase_select << 9);
-	result += m_op[1]->compute_volume(phase, am_offset) >> rshift;
+	result += m_special2 = m_op[1]->compute_volume(phase, am_offset) >> rshift;
 	result = clamp(result, -clipmax - 1, clipmax);
 
 	// add to the output
diff --git a/src/engine/platform/sound/ymfm/ymfm_opl.h b/src/engine/platform/sound/ymfm/ymfm_opl.h
index 843e5b274..8a2dd5147 100644
--- a/src/engine/platform/sound/ymfm/ymfm_opl.h
+++ b/src/engine/platform/sound/ymfm/ymfm_opl.h
@@ -528,6 +528,8 @@ public:
 
 	// generate samples of sound
 	void generate(output_data *output, uint32_t numsamples = 1);
+
+        fm_engine* debug_fm_engine() { return &m_fm; }
 protected:
 	// internal state
 	uint8_t m_address;               // address register
@@ -575,6 +577,9 @@ public:
 	// generate samples of sound
 	void generate(output_data *output, uint32_t numsamples = 1);
 
+        fm_engine* debug_fm_engine() { return &m_fm; }
+        adpcm_b_engine* debug_adpcm_b_engine() { return &m_adpcm_b; }
+
 protected:
 	// internal state
 	uint8_t m_address;               // address register
@@ -623,6 +628,8 @@ public:
 	// generate samples of sound
 	void generate(output_data *output, uint32_t numsamples = 1);
 
+        fm_engine* debug_fm_engine() { return &m_fm; }
+
 protected:
 	// internal state
 	uint8_t m_address;               // address register
@@ -670,6 +677,8 @@ public:
 	// generate samples of sound
 	void generate(output_data *output, uint32_t numsamples = 1);
 
+        fm_engine* debug_fm_engine() { return &m_fm; }
+
 protected:
 	// internal state
 	uint16_t m_address;              // address register
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 39a412e9b..10bcd2c66 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1476,6 +1476,8 @@ class FurnaceGUI {
     int c64Core;
     int pokeyCore;
     int opnCore;
+    int opl2Core;
+    int opl3Core;
     int arcadeCoreRender;
     int ym2612CoreRender;
     int snCoreRender;
@@ -1484,6 +1486,8 @@ class FurnaceGUI {
     int c64CoreRender;
     int pokeyCoreRender;
     int opnCoreRender;
+    int opl2CoreRender;
+    int opl3CoreRender;
     int pcSpeakerOutMethod;
     String yrw801Path;
     String tg100Path;
@@ -1669,6 +1673,8 @@ class FurnaceGUI {
       c64Core(0),
       pokeyCore(1),
       opnCore(1),
+      opl2Core(0),
+      opl3Core(0),
       arcadeCoreRender(1),
       ym2612CoreRender(0),
       snCoreRender(0),
@@ -1677,6 +1683,8 @@ class FurnaceGUI {
       c64CoreRender(1),
       pokeyCoreRender(1),
       opnCoreRender(1),
+      opl2CoreRender(0),
+      opl3CoreRender(0),
       pcSpeakerOutMethod(0),
       yrw801Path(""),
       tg100Path(""),
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index 86be7e547..c7ff6b29b 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -156,6 +156,18 @@ const char* opnCores[]={
   "Nuked-OPN2 (FM) + ymfm (SSG/ADPCM)"
 };
 
+const char* opl2Cores[]={
+  "Nuked-OPL3",
+  "ymfm",
+  "YM3812-LLE"
+};
+
+const char* opl3Cores[]={
+  "Nuked-OPL3",
+  "ymfm",
+  "YMF262-LLE"
+};
+
 const char* pcspkrOutMethods[]={
   "evdev SND_TONE",
   "KIOCSOUND on /dev/tty1",
@@ -1557,6 +1569,29 @@ void FurnaceGUI::drawSettings() {
           ImGui::TableNextColumn();
           ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
           if (ImGui::Combo("##OPNCoreRender",&settings.opnCoreRender,opnCores,2)) settingsChanged=true;
+
+          ImGui::TableNextRow();
+          ImGui::TableNextColumn();
+          ImGui::AlignTextToFramePadding();
+          ImGui::Text("OPL/OPL2/Y8950");
+          ImGui::TableNextColumn();
+          ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+          if (ImGui::Combo("##OPL2Core",&settings.opl2Core,opl2Cores,3)) settingsChanged=true;
+          ImGui::TableNextColumn();
+          ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+          if (ImGui::Combo("##OPL2CoreRender",&settings.opl2CoreRender,opl2Cores,3)) settingsChanged=true;
+
+          ImGui::TableNextRow();
+          ImGui::TableNextColumn();
+          ImGui::AlignTextToFramePadding();
+          ImGui::Text("OPL3");
+          ImGui::TableNextColumn();
+          ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+          if (ImGui::Combo("##OPL3Core",&settings.opl3Core,opl3Cores,3)) settingsChanged=true;
+          ImGui::TableNextColumn();
+          ImGui::SetNextItemWidth(ImGui::GetContentRegionAvail().x);
+          if (ImGui::Combo("##OPL3CoreRender",&settings.opl3CoreRender,opl3Cores,3)) settingsChanged=true;
+
           ImGui::EndTable();
         }
         ImGui::Separator();
@@ -3594,6 +3629,8 @@ void FurnaceGUI::syncSettings() {
   settings.c64Core=e->getConfInt("c64Core",0);
   settings.pokeyCore=e->getConfInt("pokeyCore",1);
   settings.opnCore=e->getConfInt("opnCore",1);
+  settings.opl2Core=e->getConfInt("opl2Core",0);
+  settings.opl3Core=e->getConfInt("opl3Core",0);
   settings.arcadeCoreRender=e->getConfInt("arcadeCoreRender",1);
   settings.ym2612CoreRender=e->getConfInt("ym2612CoreRender",0);
   settings.snCoreRender=e->getConfInt("snCoreRender",0);
@@ -3602,6 +3639,8 @@ void FurnaceGUI::syncSettings() {
   settings.c64CoreRender=e->getConfInt("c64CoreRender",1);
   settings.pokeyCoreRender=e->getConfInt("pokeyCoreRender",1);
   settings.opnCoreRender=e->getConfInt("opnCoreRender",1);
+  settings.opl2CoreRender=e->getConfInt("opl2CoreRender",0);
+  settings.opl3CoreRender=e->getConfInt("opl3CoreRender",0);
   settings.pcSpeakerOutMethod=e->getConfInt("pcSpeakerOutMethod",0);
   settings.yrw801Path=e->getConfString("yrw801Path","");
   settings.tg100Path=e->getConfString("tg100Path","");
@@ -3778,6 +3817,8 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.c64Core,0,2);
   clampSetting(settings.pokeyCore,0,1);
   clampSetting(settings.opnCore,0,1);
+  clampSetting(settings.opl2Core,0,2);
+  clampSetting(settings.opl3Core,0,2);
   clampSetting(settings.arcadeCoreRender,0,1);
   clampSetting(settings.ym2612CoreRender,0,1);
   clampSetting(settings.snCoreRender,0,1);
@@ -3786,6 +3827,8 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.c64CoreRender,0,2);
   clampSetting(settings.pokeyCoreRender,0,1);
   clampSetting(settings.opnCoreRender,0,1);
+  clampSetting(settings.opl2CoreRender,0,2);
+  clampSetting(settings.opl3CoreRender,0,2);
   clampSetting(settings.pcSpeakerOutMethod,0,4);
   clampSetting(settings.mainFont,0,6);
   clampSetting(settings.patFont,0,6);
@@ -3991,6 +4034,8 @@ void FurnaceGUI::commitSettings() {
     settings.c64Core!=e->getConfInt("c64Core",0) ||
     settings.pokeyCore!=e->getConfInt("pokeyCore",1) ||
     settings.opnCore!=e->getConfInt("opnCore",1) ||
+    settings.opl2Core!=e->getConfInt("opl2Core",0) ||
+    settings.opl3Core!=e->getConfInt("opl3Core",0) ||
     settings.arcadeCoreRender!=e->getConfInt("arcadeCoreRender",0) ||
     settings.ym2612CoreRender!=e->getConfInt("ym2612CoreRender",0) ||
     settings.snCoreRender!=e->getConfInt("snCoreRender",0) ||
@@ -3999,6 +4044,8 @@ void FurnaceGUI::commitSettings() {
     settings.c64CoreRender!=e->getConfInt("c64CoreRender",0) ||
     settings.pokeyCoreRender!=e->getConfInt("pokeyCoreRender",1) ||
     settings.opnCoreRender!=e->getConfInt("opnCoreRender",1) ||
+    settings.opl2CoreRender!=e->getConfInt("opl2CoreRender",0) ||
+    settings.opl3CoreRender!=e->getConfInt("opl3CoreRender",0) ||
     settings.audioQuality!=e->getConfInt("audioQuality",0) ||
     settings.audioHiPass!=e->getConfInt("audioHiPass",1)
   );
@@ -4026,6 +4073,8 @@ void FurnaceGUI::commitSettings() {
   e->setConf("c64Core",settings.c64Core);
   e->setConf("pokeyCore",settings.pokeyCore);
   e->setConf("opnCore",settings.opnCore);
+  e->setConf("opl2Core",settings.opl2Core);
+  e->setConf("opl3Core",settings.opl3Core);
   e->setConf("arcadeCoreRender",settings.arcadeCoreRender);
   e->setConf("ym2612CoreRender",settings.ym2612CoreRender);
   e->setConf("snCoreRender",settings.snCoreRender);
@@ -4034,6 +4083,8 @@ void FurnaceGUI::commitSettings() {
   e->setConf("c64CoreRender",settings.c64CoreRender);
   e->setConf("pokeyCoreRender",settings.pokeyCoreRender);
   e->setConf("opnCoreRender",settings.opnCoreRender);
+  e->setConf("opl2CoreRender",settings.opl2CoreRender);
+  e->setConf("opl3CoreRender",settings.opl3CoreRender);
   e->setConf("pcSpeakerOutMethod",settings.pcSpeakerOutMethod);
   e->setConf("yrw801Path",settings.yrw801Path);
   e->setConf("tg100Path",settings.tg100Path);