diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 6abc2c343..e0f23d5f9 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -160,7 +160,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
         unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
         DivInstrumentFM::Operator op=ins->fm.op[i];
         if (isOutput[ins->fm.alg][i]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*chan[c.chan].vol)/127));
+          rWrite(baseAddr+0x40,127-(((127-op.tl)*(chan[c.chan].vol&0x7f))/127));
         } else {
           if (chan[c.chan].insChanged) {
             rWrite(baseAddr+0x40,op.tl);
@@ -198,7 +198,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
         unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
         DivInstrumentFM::Operator op=ins->fm.op[i];
         if (isOutput[ins->fm.alg][i]) {
-          rWrite(baseAddr+0x40,127-(((127-op.tl)*chan[c.chan].vol)/127));
+          rWrite(baseAddr+0x40,127-(((127-op.tl)*(chan[c.chan].vol&0x7f))/127));
         } else {
           rWrite(baseAddr+0x40,op.tl);
         }
@@ -279,7 +279,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
       unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
       DivInstrument* ins=parent->getIns(chan[c.chan].ins);
       if (isOutput[ins->fm.alg][c.value]) {
-        rWrite(baseAddr+0x40,127-(((127-c.value2)*chan[c.chan].vol)/127));
+        rWrite(baseAddr+0x40,127-(((127-c.value2)*(chan[c.chan].vol&0x7f))/127));
       } else {
         rWrite(baseAddr+0x40,c.value2);
       }
diff --git a/src/engine/platform/genesis.h b/src/engine/platform/genesis.h
index e0d5a9f79..8f486e180 100644
--- a/src/engine/platform/genesis.h
+++ b/src/engine/platform/genesis.h
@@ -14,7 +14,7 @@ class DivPlatformGenesis: public DivDispatch {
       unsigned char ins;
       signed char konCycles;
       bool active, insChanged, freqChanged, keyOn, keyOff;
-      signed char vol;
+      int vol;
       unsigned char pan;
       Channel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), vol(0), pan(3) {}
     };