diff --git a/src/engine/platform/opl.cpp b/src/engine/platform/opl.cpp
index 55086c71d..6405c6b72 100644
--- a/src/engine/platform/opl.cpp
+++ b/src/engine/platform/opl.cpp
@@ -2430,12 +2430,16 @@ int DivPlatformOPL::dispatch(DivCommand c) {
       break;
     case DIV_CMD_MULTIPCM_MIX_FM:
       if (chipType==4) {
-        rWrite(PCM_ADDR_MIX_FM,(CLAMP((0x70-(c.value&0x70)),0,0x70)>>1)|(CLAMP((7-(c.value&7)),0,7)));
+        fmMixL=CLAMP((c.value&0x70)>>4,0,7);
+        fmMixR=CLAMP((c.value&0x7),0,7);
+        immWrite(PCM_ADDR_MIX_FM,((7-fmMixR)<<3)|(7-fmMixL));
       }
       break;
     case DIV_CMD_MULTIPCM_MIX_PCM:
       if (chipType==4) {
-        rWrite(PCM_ADDR_MIX_PCM,(CLAMP((0x70-(c.value&0x70)),0,0x70)>>1)|(CLAMP((7-(c.value&7)),0,7)));
+        pcmMixL=CLAMP((c.value&0x70)>>4,0,7);
+        pcmMixR=CLAMP((c.value&0x7),0,7);
+        immWrite(PCM_ADDR_MIX_PCM,((7-pcmMixR)<<3)|(7-pcmMixL));
       }
       break;
     case DIV_CMD_MULTIPCM_LFO:
@@ -2844,6 +2848,13 @@ void DivPlatformOPL::reset() {
       immWrite(0x105,3);
       // Reset wavetable header
       immWrite(0x202,(ramSize<=0x200000)?0x10:0x00);
+      // initialize mixer volume
+      fmMixL=7;
+      fmMixR=7;
+      pcmMixL=7;
+      pcmMixR=7;
+      immWrite(PCM_ADDR_MIX_FM,((7-fmMixR)<<3)|(7-fmMixL));
+      immWrite(PCM_ADDR_MIX_PCM,((7-pcmMixR)<<3)|(7-pcmMixL));
     } else {
       immWrite(0x105,1);
     }
diff --git a/src/engine/platform/opl.h b/src/engine/platform/opl.h
index e62f5ec84..453fa6786 100644
--- a/src/engine/platform/opl.h
+++ b/src/engine/platform/opl.h
@@ -134,6 +134,7 @@ class DivPlatformOPL: public DivDispatch {
     const unsigned char* outChanMap;
     int chipFreqBase, chipRateBase;
     int delay, chipType, oplType, chans, melodicChans, totalChans, adpcmChan=-1, pcmChanOffs=-1, sampleBank, totalOutputs, ramSize;
+    int fmMixL=7, fmMixR=7, pcmMixL=7, pcmMixR=7;
     unsigned char lastBusy;
     unsigned char drumState;
     unsigned char drumVol[5];
diff --git a/src/engine/sysDef.cpp b/src/engine/sysDef.cpp
index bdadfa11f..6ba055993 100644
--- a/src/engine/sysDef.cpp
+++ b/src/engine/sysDef.cpp
@@ -601,8 +601,8 @@ void DivEngine::registerSystems() {
 
   EffectHandlerMap fmOPL4PostEffectHandlerMap(fmOPLPostEffectHandlerMap);
   fmOPL4PostEffectHandlerMap.insert({
-    {0x1e, {DIV_CMD_MULTIPCM_MIX_FM, _("1Exy: FM global level (left, right; 0 to 7)"), effectVal}},
-    {0x1f, {DIV_CMD_MULTIPCM_MIX_PCM, _("1Fxy: PCM global level (left, right; 0 to 7)"), effectVal}},
+    {0x1e, {DIV_CMD_MULTIPCM_MIX_FM, _("1Exy: FM global level (x: left, y: right; 0 to 7)"), effectVal}},
+    {0x1f, {DIV_CMD_MULTIPCM_MIX_PCM, _("1Fxy: PCM global level (x: left, y: right; 0 to 7)"), effectVal}},
     {0x20, {DIV_CMD_MULTIPCM_LFO, _("20xx: PCM LFO Rate (0 to 7)"), effectValAnd<7>}},
     {0x21, {DIV_CMD_MULTIPCM_VIB, _("21xx: PCM LFO PM Depth (0 to 7)"), effectValAnd<7>}},
     {0x22, {DIV_CMD_MULTIPCM_AM, _("22xx: PCM LFO AM Depth (0 to 7)"), effectValAnd<7>}},