diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index 97f52ddac..b743a02ba 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -772,6 +772,9 @@ void DivPlatformGenesisExt::forceIns() {
     chan[csmChan].freqChanged=true;
     chan[csmChan].keyOn=true;
   }
+  if (!extMode) {
+    immWrite(0x27,0x00);
+  }
 }
 
 void* DivPlatformGenesisExt::getChanState(int ch) {
diff --git a/src/engine/platform/ym2203ext.cpp b/src/engine/platform/ym2203ext.cpp
index 062431101..4791d513e 100644
--- a/src/engine/platform/ym2203ext.cpp
+++ b/src/engine/platform/ym2203ext.cpp
@@ -671,6 +671,9 @@ void DivPlatformYM2203Ext::forceIns() {
       opChan[i].freqChanged=true;
     }
   }
+  if (!extMode) {
+    immWrite(0x27,0x00);
+  }
 }
 
 void* DivPlatformYM2203Ext::getChanState(int ch) {
diff --git a/src/engine/platform/ym2608ext.cpp b/src/engine/platform/ym2608ext.cpp
index e09afa182..a2e0f25a5 100644
--- a/src/engine/platform/ym2608ext.cpp
+++ b/src/engine/platform/ym2608ext.cpp
@@ -721,6 +721,9 @@ void DivPlatformYM2608Ext::forceIns() {
       opChan[i].freqChanged=true;
     }
   }
+  if (!extMode) {
+    immWrite(0x27,0x00);
+  }
 }
 
 void* DivPlatformYM2608Ext::getChanState(int ch) {
diff --git a/src/engine/platform/ym2610bext.cpp b/src/engine/platform/ym2610bext.cpp
index 747f3f600..7f38830b3 100644
--- a/src/engine/platform/ym2610bext.cpp
+++ b/src/engine/platform/ym2610bext.cpp
@@ -711,6 +711,9 @@ void DivPlatformYM2610BExt::forceIns() {
       opChan[i].freqChanged=true;
     }
   }
+  if (!extMode) {
+    immWrite(0x27,0x00);
+  }
 }
 
 void* DivPlatformYM2610BExt::getChanState(int ch) {
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 21f38048f..9f84aa72c 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -711,6 +711,9 @@ void DivPlatformYM2610Ext::forceIns() {
       opChan[i].freqChanged=true;
     }
   }
+  if (!extMode) {
+    immWrite(0x27,0x00);
+  }
 }
 
 void* DivPlatformYM2610Ext::getChanState(int ch) {