diff --git a/src/emucore/CartBUS.cxx b/src/emucore/CartBUS.cxx
index 0e47d4329..698488772 100644
--- a/src/emucore/CartBUS.cxx
+++ b/src/emucore/CartBUS.cxx
@@ -157,7 +157,7 @@ inline void CartridgeBUS::updateMusicModeDataFetchers()
   // Let's update counters and flags of the music mode data fetchers
   for(int x = 0; x <= 2; ++x)
   {
-    myMusicCounters[x] += myMusicFrequencies[x];
+    myMusicCounters[x] += myMusicFrequencies[x] * wholeClocks;
   }
 }
 
diff --git a/src/emucore/CartCDF.cxx b/src/emucore/CartCDF.cxx
index b38ed0051..1f89afd07 100644
--- a/src/emucore/CartCDF.cxx
+++ b/src/emucore/CartCDF.cxx
@@ -159,7 +159,7 @@ inline void CartridgeCDF::updateMusicModeDataFetchers()
   // Let's update counters and flags of the music mode data fetchers
   for(int x = 0; x <= 2; ++x)
   {
-    myMusicCounters[x] += myMusicFrequencies[x];
+    myMusicCounters[x] += myMusicFrequencies[x] * wholeClocks;
   }
 }
 
diff --git a/src/emucore/CartDPCPlus.cxx b/src/emucore/CartDPCPlus.cxx
index 4b6862d1b..8570400bb 100644
--- a/src/emucore/CartDPCPlus.cxx
+++ b/src/emucore/CartDPCPlus.cxx
@@ -173,7 +173,7 @@ inline void CartridgeDPCPlus::updateMusicModeDataFetchers()
   // Let's update counters and flags of the music mode data fetchers
   for(int x = 0; x <= 2; ++x)
   {
-    myMusicCounters[x] += myMusicFrequencies[x];
+    myMusicCounters[x] += myMusicFrequencies[x] * wholeClocks;
   }
 }