diff --git a/src/engine/platform/genesis.cpp b/src/engine/platform/genesis.cpp
index 10a8762c..0aff2b43 100644
--- a/src/engine/platform/genesis.cpp
+++ b/src/engine/platform/genesis.cpp
@@ -542,6 +542,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].portaPause=false;
         chan[c.chan].note=c.value;
         chan[c.chan].freqChanged=true;
       }
diff --git a/src/engine/platform/genesisext.cpp b/src/engine/platform/genesisext.cpp
index 02305a9a..b53cd389 100644
--- a/src/engine/platform/genesisext.cpp
+++ b/src/engine/platform/genesisext.cpp
@@ -73,6 +73,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
+        opChan[ch].portaPause=false;
         opChan[ch].freqChanged=true;
       }
       opChan[ch].keyOn=true;
diff --git a/src/engine/platform/ym2610.cpp b/src/engine/platform/ym2610.cpp
index 8d762663..eb5fa86a 100644
--- a/src/engine/platform/ym2610.cpp
+++ b/src/engine/platform/ym2610.cpp
@@ -829,6 +829,7 @@ int DivPlatformYM2610::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].portaPause=false;
         chan[c.chan].freqChanged=true;
         chan[c.chan].note=c.value;
       }
diff --git a/src/engine/platform/ym2610b.cpp b/src/engine/platform/ym2610b.cpp
index 1d954ebe..745efa22 100644
--- a/src/engine/platform/ym2610b.cpp
+++ b/src/engine/platform/ym2610b.cpp
@@ -892,6 +892,7 @@ int DivPlatformYM2610B::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].portaPause=false;
         chan[c.chan].freqChanged=true;
         chan[c.chan].note=c.value;
       }
diff --git a/src/engine/platform/ym2610bext.cpp b/src/engine/platform/ym2610bext.cpp
index 5b3c3872..e8521573 100644
--- a/src/engine/platform/ym2610bext.cpp
+++ b/src/engine/platform/ym2610bext.cpp
@@ -63,6 +63,7 @@ int DivPlatformYM2610BExt::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
+        opChan[ch].portaPause=false;
         opChan[ch].freqChanged=true;
       }
       opChan[ch].keyOn=true;
diff --git a/src/engine/platform/ym2610ext.cpp b/src/engine/platform/ym2610ext.cpp
index 5e633eb2..63d584d0 100644
--- a/src/engine/platform/ym2610ext.cpp
+++ b/src/engine/platform/ym2610ext.cpp
@@ -63,6 +63,7 @@ int DivPlatformYM2610Ext::dispatch(DivCommand c) {
 
       if (c.value!=DIV_NOTE_NULL) {
         opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
+        opChan[ch].portaPause=false;
         opChan[ch].freqChanged=true;
       }
       opChan[ch].keyOn=true;