diff --git a/UIThread.cpp b/UIThread.cpp
index e576314..c0eb3b2 100644
--- a/UIThread.cpp
+++ b/UIThread.cpp
@@ -242,7 +242,11 @@ void generateTheme(int themeType) {
 }
 
 void mutateSequence(Step (*target)[NUM_STEPS]) {
-  for(int i=0; i<NUM_TRACKS; i++) strategies[currentStrategyIndices[i]]->mutate(target, i, numSteps[i], scaleNotes, numScaleNotes, trackIntensity[i]);
+  for(int i=0; i<NUM_TRACKS; i++) {
+    if (random(100) < (trackIntensity[i] * 10)) {
+      strategies[currentStrategyIndices[i]]->mutate(target, i, numSteps[i], scaleNotes, numScaleNotes, trackIntensity[i]);
+    }
+  }
 }
 
 static void handleInput() {