diff --git a/packages/webaudio/examples/repl.html b/packages/webaudio/examples/repl.html
index f39826cd..6f0d84bf 100644
--- a/packages/webaudio/examples/repl.html
+++ b/packages/webaudio/examples/repl.html
@@ -18,10 +18,13 @@ Loading...</textarea
   const { cat, State, TimeSpan } = strudel;
   Object.assign(window, strudel); // add strudel to eval scope
 
-  const audioContext = getAudioContext();
-  const interval = 0.1;
-  const lookahead = 0.5;
-  const scheduler = new Scheduler(audioContext, interval, lookahead);
+  const scheduler = new Scheduler({
+    audioContext: getAudioContext(),
+    interval: 0.1,
+    onEvent: (e) => {
+      e.context?.createAudioNode?.(e);
+    },
+  });
 
   let initialCode = `sequence(1,2).mul(55/2) // frequencies
 .mul(slowcat(1,2))
diff --git a/packages/webaudio/scheduler.mjs b/packages/webaudio/scheduler.mjs
index 8a82796c..3f41266d 100644
--- a/packages/webaudio/scheduler.mjs
+++ b/packages/webaudio/scheduler.mjs
@@ -3,7 +3,7 @@ import ClockWorker from './clockworker.mjs';
 class Scheduler {
   worker;
   pattern;
-  constructor(audioContext, interval = 0.2) {
+  constructor({ audioContext, interval = 0.2, onEvent }) {
     this.worker = new ClockWorker(
       audioContext,
       (begin, end) => {
@@ -11,10 +11,10 @@ class Scheduler {
           if (!e.part.begin.equals(e.whole.begin)) {
             return;
           }
-          if (e.context.createAudioNode) {
-            e.context.createAudioNode(e);
+          if (onEvent) {
+            onEvent?.(e);
           } else {
-            console.warn('unplayable event: no audio node');
+            console.warn('unplayable event: no audio node nor onEvent callback', e);
           }
         });
       },