diff --git a/papers/doc/7-systems/opz.md b/papers/doc/7-systems/opz.md
index c7952a55b..555df814f 100644
--- a/papers/doc/7-systems/opz.md
+++ b/papers/doc/7-systems/opz.md
@@ -45,6 +45,16 @@ no plans have been made for TX81Z MIDI passthrough, because:
 - `1Bxx`: set attack of operator 2.
 - `1Cxx`: set attack of operator 3.
 - `1Dxx`: set attack of operator 4.
+- `1Exx`: set LFO AM depth.
+- `1Fxx`: set LFO PM depth.
+- `24xx`: set LFO 2 speed.
+- `25xx`: set LFO 2 waveform. `xx` may be one of the following:
+  - `00`: saw
+  - `01`: square
+  - `02`: triangle
+  - `03`: noise
+- `26xx`: set LFO 2 AM depth.
+- `27xx`: set LFO 2 PM depth.
 - `28xy`: set reverb of operator.
   - `x` is the operator (1-4). a value of 0 means "all operators".
   - `y` is the value.
diff --git a/src/engine/dispatch.h b/src/engine/dispatch.h
index 0378eba26..32540db2a 100644
--- a/src/engine/dispatch.h
+++ b/src/engine/dispatch.h
@@ -103,9 +103,8 @@ enum DivDispatchCmds {
   DIV_CMD_FM_AM_DEPTH, // (depth)
   DIV_CMD_FM_PM_DEPTH, // (depth)
 
-  DIV_CMD_GENESIS_LFO, // unused?
-  
-  DIV_CMD_ARCADE_LFO, // unused?
+  DIV_CMD_FM_LFO2, // (speed)
+  DIV_CMD_FM_LFO2_WAVE, // (waveform)
 
   DIV_CMD_STD_NOISE_FREQ, // (freq)
   DIV_CMD_STD_NOISE_MODE, // (mode)
@@ -215,6 +214,9 @@ enum DivDispatchCmds {
 
   DIV_CMD_SURROUND_PANNING, // (out, val)
 
+  DIV_CMD_FM_AM2_DEPTH, // (depth)
+  DIV_CMD_FM_PM2_DEPTH, // (depth)
+
   DIV_ALWAYS_SET_VOLUME, // () -> alwaysSetVol
 
   DIV_CMD_MAX
diff --git a/src/engine/platform/fmshared_OPM.h b/src/engine/platform/fmshared_OPM.h
index 02c30b7eb..e922e8abb 100644
--- a/src/engine/platform/fmshared_OPM.h
+++ b/src/engine/platform/fmshared_OPM.h
@@ -41,8 +41,14 @@ class DivPlatformOPM: public DivPlatformFMBase {
       0x00, 0x08, 0x10, 0x18
     };
 
+    unsigned char lfoValue, lfoValue2, lfoShape, lfoShape2;
+
     DivPlatformOPM():
-      DivPlatformFMBase() {}
+      DivPlatformFMBase(),
+      lfoValue(0),
+      lfoValue2(0),
+      lfoShape(0),
+      lfoShape2(0) {}
 };
 
 #endif
diff --git a/src/engine/platform/tx81z.cpp b/src/engine/platform/tx81z.cpp
index db728489e..80e69f195 100644
--- a/src/engine/platform/tx81z.cpp
+++ b/src/engine/platform/tx81z.cpp
@@ -26,6 +26,8 @@
 #define ADDR_WS_FINE 0x100
 // actually 0xc0 but bit 5 of data selects address
 #define ADDR_EGS_REV 0x120
+// actually 0x38 but bits 7 and 2 select address
+#define ADDR_FMS2_AMS2 0x140
 
 const char* regCheatSheetOPZ[]={
   "Test", "00",
@@ -139,7 +141,8 @@ void DivPlatformTX81Z::tick(bool sysTick) {
     }
 
     if (chan[i].std.wave.had) {
-      rWrite(0x1b,chan[i].std.wave.val&3);
+      lfoShape=chan[i].std.wave.val&3;
+      immWrite(0x1b,lfoShape|(lfoShape2<<2));
     }
 
     if (chan[i].std.pitch.had) {
@@ -177,7 +180,28 @@ void DivPlatformTX81Z::tick(bool sysTick) {
     }
 
     if (chan[i].std.ex3.had) {
-      immWrite(0x18,chan[i].std.ex3.val);
+      lfoValue=chan[i].std.ex3.val;
+      immWrite(0x18,lfoValue);
+    }
+
+    if (chan[i].std.ex5.had) {
+      amDepth2=chan[i].std.ex5.val;
+      immWrite(0x17,amDepth2);
+    }
+
+    if (chan[i].std.ex6.had) {
+      pmDepth2=chan[i].std.ex6.val;
+      immWrite(0x17,0x80|pmDepth2);
+    }
+
+    if (chan[i].std.ex7.had) {
+      lfoValue2=chan[i].std.ex7.val;
+      immWrite(0x16,lfoValue2);
+    }
+
+    if (chan[i].std.ex8.had) {
+      lfoShape2=chan[i].std.ex8.val&3;
+      immWrite(0x1b,lfoShape|(lfoShape2<<2));
     }
 
     if (chan[i].std.alg.had) {
@@ -286,6 +310,12 @@ void DivPlatformTX81Z::tick(bool sysTick) {
       oldWrites[i]=pendingWrites[i];
     }
   }
+  for (int i=320; i<328; i++) {
+    if (pendingWrites[i]!=oldWrites[i]) {
+      immWrite(0x38+(i&7),(0x84|pendingWrites[i]));
+      oldWrites[i]=pendingWrites[i];
+    }
+  }
 
   int hardResetElapsed=0;
   bool mustHardReset=false;
@@ -405,7 +435,7 @@ void DivPlatformTX81Z::commitState(int ch, DivInstrument* ins) {
       rWrite(chanOffs[ch]+ADDR_LR_FB_ALG,(chan[ch].state.alg&7)|(chan[ch].state.fb<<3)|((chan[ch].chVolL&1)<<6)|((chan[ch].chVolR&1)<<7));
     }*/
     rWrite(chanOffs[ch]+ADDR_FMS_AMS,((chan[ch].state.fms&7)<<4)|(chan[ch].state.ams&3));
-    //rWrite(chanOffs[ch]+ADDR_FMS_AMS,0x84|((chan[ch].state.fms2&7)<<4)|(chan[ch].state.ams2&3));
+    rWrite(chanOffs[ch]+ADDR_FMS2_AMS2,((chan[ch].state.fms2&7)<<4)|(chan[ch].state.ams2&3));
   }
 }
 
@@ -528,11 +558,23 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_FM_LFO: {
-      rWrite(0x18,c.value);
+      lfoValue=c.value;
+      immWrite(0x18,lfoValue);
       break;
     }
     case DIV_CMD_FM_LFO_WAVE: {
-      rWrite(0x1b,c.value&3);
+      lfoShape=c.value&3;
+      immWrite(0x1b,lfoShape|(lfoShape2<<2));
+      break;
+    }
+    case DIV_CMD_FM_LFO2: {
+      lfoValue2=c.value;
+      immWrite(0x16,lfoValue2);
+      break;
+    }
+    case DIV_CMD_FM_LFO2_WAVE: {
+      lfoShape2=c.value&3;
+      immWrite(0x1b,lfoShape|(lfoShape2<<2));
       break;
     }
     case DIV_CMD_FM_FB: {
@@ -810,6 +852,16 @@ int DivPlatformTX81Z::dispatch(DivCommand c) {
       immWrite(0x19,0x80|pmDepth);
       break;
     }
+    case DIV_CMD_FM_AM2_DEPTH: {
+      amDepth2=c.value;
+      immWrite(0x17,amDepth);
+      break;
+    }
+    case DIV_CMD_FM_PM2_DEPTH: {
+      pmDepth2=c.value;
+      immWrite(0x17,0x80|pmDepth);
+      break;
+    }
     case DIV_CMD_FM_HARD_RESET:
       chan[c.chan].hardReset=c.value;
       break;
@@ -880,7 +932,7 @@ void DivPlatformTX81Z::forceIns() {
       rWrite(chanOffs[i]+ADDR_LR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3)|((chan[i].chVolL&1)<<6)|((chan[i].chVolR&1)<<7));
     }*/
     rWrite(chanOffs[i]+ADDR_FMS_AMS,((chan[i].state.fms&7)<<4)|(chan[i].state.ams&3));
-    //rWrite(chanOffs[i]+ADDR_FMS_AMS,0x84|((chan[i].state.fms2&7)<<4)|(chan[i].state.ams2&3));
+    rWrite(chanOffs[i]+ADDR_FMS2_AMS2,((chan[i].state.fms2&7)<<4)|(chan[i].state.ams2&3));
     if (chan[i].active) {
       chan[i].keyOn=true;
       chan[i].freqChanged=true;
@@ -888,6 +940,11 @@ void DivPlatformTX81Z::forceIns() {
   }
   immWrite(0x19,amDepth);
   immWrite(0x19,0x80|pmDepth);
+  immWrite(0x17,amDepth2);
+  immWrite(0x17,0x80|pmDepth2);
+  immWrite(0x18,lfoValue);
+  immWrite(0x16,lfoValue2);
+  immWrite(0x1b,lfoShape|(lfoShape2<<2));
 }
 
 void DivPlatformTX81Z::notifyInsChange(int ins) {
@@ -958,12 +1015,19 @@ void DivPlatformTX81Z::reset() {
   delay=0;
   amDepth=0x7f;
   pmDepth=0x7f;
+  amDepth2=0x7f;
+  pmDepth2=0x7f;
+  lfoValue=0;
+  lfoValue2=0;
+  lfoShape=0;
+  lfoShape2=0;
 
-  //rWrite(0x18,0x10);
   immWrite(0x18,0x00); // LFO Freq Off
+  immWrite(0x16,0x00);
   immWrite(0x19,amDepth);
   immWrite(0x19,0x80|pmDepth);
-  //rWrite(0x1b,0x00);
+  immWrite(0x17,amDepth2);
+  immWrite(0x17,0x80|pmDepth2);
 
   extMode=false;
 }
diff --git a/src/engine/platform/tx81z.h b/src/engine/platform/tx81z.h
index e15158b7c..d1ebd543e 100644
--- a/src/engine/platform/tx81z.h
+++ b/src/engine/platform/tx81z.h
@@ -45,7 +45,7 @@ class DivPlatformTX81Z: public DivPlatformOPM {
     DivDispatchOscBuffer* oscBuf[8];
     int baseFreqOff;
     int pcmL, pcmR, pcmCycles;
-    unsigned char amDepth, pmDepth;
+    unsigned char amDepth, pmDepth, amDepth2, pmDepth2;
 
     ymfm::ym2414* fm_ymfm;
     ymfm::ym2414::output_data out_ymfm;
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index cc231817a..485a020dd 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -103,9 +103,8 @@ const char* cmdName[]={
   "FM_AM_DEPTH",
   "FM_PM_DEPTH",
 
-  "GENESIS_LFO",
-  
-  "ARCADE_LFO",
+  "FM_LFO2",
+  "FM_LFO2_WAVE",
 
   "STD_NOISE_FREQ",
   "STD_NOISE_MODE",
@@ -215,6 +214,9 @@ const char* cmdName[]={
 
   "SURROUND_PANNING",
 
+  "FM_AM2_DEPTH",
+  "FM_PM2_DEPTH",
+
   "ALWAYS_SET_VOLUME"
 };
 
diff --git a/src/engine/sysDef.cpp b/src/engine/sysDef.cpp
index 0fc35f1ae..154ad7eb3 100644
--- a/src/engine/sysDef.cpp
+++ b/src/engine/sysDef.cpp
@@ -504,6 +504,10 @@ void DivEngine::registerSystems() {
 
   EffectHandlerMap fmOPZPostEffectHandlerMap(fmOPMPostEffectHandlerMap);
   fmOPZPostEffectHandlerMap.insert({
+    {0x24, {DIV_CMD_FM_LFO2, "24xx: Set LFO 2 speed"}},
+    {0x25, {DIV_CMD_FM_LFO2_WAVE, "25xx: Set LFO 2 waveform (0 saw, 1 square, 2 triangle, 3 noise)"}},
+    {0x26, {DIV_CMD_FM_AM2_DEPTH, "26xx: Set AM 2 depth (0 to 7F)", effectValAnd<127>}},
+    {0x27, {DIV_CMD_FM_PM2_DEPTH, "27xx: Set PM 2 depth (0 to 7F)", effectValAnd<127>}},
     {0x28, {DIV_CMD_FM_REV, "28xy: Set reverb (x: operator from 1 to 4 (0 for all ops); y: reverb from 0 to 7)", effectOpVal<4>, effectValAnd<7>}},
     {0x2a, {DIV_CMD_FM_WS, "2Axy: Set waveform (x: operator from 1 to 4 (0 for all ops); y: waveform from 0 to 7)", effectOpVal<4>, effectValAnd<7>}},
     {0x2b, {DIV_CMD_FM_EG_SHIFT, "2Bxy: Set envelope generator shift (x: operator from 1 to 4 (0 for all ops); y: shift from 0 to 3)", effectOpVal<4>, effectValAnd<3>}},