diff --git a/repl/src/useCycle.ts b/repl/src/useCycle.ts
index 891bb3ee..6e1ed5e7 100644
--- a/repl/src/useCycle.ts
+++ b/repl/src/useCycle.ts
@@ -53,7 +53,7 @@ function useCycle(props: UseCycleProps) {
         Tone.Transport.schedule((time) => {
           const toneEvent = {
             time: event.part.begin.valueOf(),
-            duration: event.part.end.valueOf() - event.part.begin.valueOf(),
+            duration: event.whole.end.valueOf() - event.whole.begin.valueOf(),
             value: event.value,
           };
           onEvent(time, toneEvent);