diff --git a/packages/core/examples/canvas.html b/packages/core/examples/canvas.html
index 685cc56e..736c9a22 100644
--- a/packages/core/examples/canvas.html
+++ b/packages/core/examples/canvas.html
@@ -27,7 +27,7 @@
       const events = pattern.firstCycle(); // query first cycle
       events.forEach((event) => {
         ctx.fillStyle = event.value;
-        ctx.fillRect(event.whole.begin * canvas.width, 0, event.duration * canvas.width, canvas.height);
+        ctx.fillRect(event.whole.begin * canvas.width, 0, event.duration.valueOf() * canvas.width, canvas.height);
       });
     }
   </script>
diff --git a/packages/midi/midi.mjs b/packages/midi/midi.mjs
index c9b93777..52d3ecbd 100644
--- a/packages/midi/midi.mjs
+++ b/packages/midi/midi.mjs
@@ -69,7 +69,7 @@ Pattern.prototype.midi = function (output, channel = 1) {
       // await enableWebMidi()
       device.playNote(note, channel, {
         time,
-        duration: event.duration * 1000 - 5,
+        duration: event.duration.valueOf() * 1000 - 5,
         velocity,
       });
     };
diff --git a/packages/tone/tone.mjs b/packages/tone/tone.mjs
index 2426dac3..cf3d750a 100644
--- a/packages/tone/tone.mjs
+++ b/packages/tone/tone.mjs
@@ -54,14 +54,14 @@ Pattern.prototype.tone = function (instrument) {
         note = getPlayableNoteValue(event);
         instrument.triggerAttack(note, time);
       } else if (instrument instanceof NoiseSynth) {
-        instrument.triggerAttackRelease(event.duration, time); // noise has no value
+        instrument.triggerAttackRelease(event.duration.valueOf(), time); // noise has no value
       } else if (instrument instanceof Piano) {
         note = getPlayableNoteValue(event);
         instrument.keyDown({ note, time, velocity });
-        instrument.keyUp({ note, time: time + event.duration, velocity });
+        instrument.keyUp({ note, time: time + event.duration.valueOf(), velocity });
       } else if (instrument instanceof Sampler) {
         note = getPlayableNoteValue(event);
-        instrument.triggerAttackRelease(note, event.duration, time, velocity);
+        instrument.triggerAttackRelease(note, event.duration.valueOf(), time, velocity);
       } else if (instrument instanceof Players) {
         if (!instrument.has(event.value)) {
           throw new Error(`name "${event.value}" not defined for players`);
@@ -69,10 +69,10 @@ Pattern.prototype.tone = function (instrument) {
         const player = instrument.player(event.value);
         // velocity ?
         player.start(time);
-        player.stop(time + event.duration);
+        player.stop(time + event.duration.valueOf());
       } else {
         note = getPlayableNoteValue(event);
-        instrument.triggerAttackRelease(note, event.duration, time, velocity);
+        instrument.triggerAttackRelease(note, event.duration.valueOf(), time, velocity);
       }
     };
     return event.setContext({ ...event.context, instrument, onTrigger });
diff --git a/packages/webaudio/webaudio.mjs b/packages/webaudio/webaudio.mjs
index de07a56e..f66f94bd 100644
--- a/packages/webaudio/webaudio.mjs
+++ b/packages/webaudio/webaudio.mjs
@@ -39,7 +39,7 @@ Pattern.prototype._wave = function (type) {
     const f = getFrequency(e);
     osc.frequency.value = f; // expects frequency..
     const begin = t ?? e.whole.begin.valueOf() + lookahead;
-    const end = begin + e.duration;
+    const end = begin + e.valueOf();
     osc.start(begin);
     osc.stop(end); // release?
     return osc;
@@ -49,7 +49,7 @@ Pattern.prototype.adsr = function (a = 0.01, d = 0.05, s = 1, r = 0.01) {
   return this.withAudioNode((t, e, node) => {
     const velocity = e.context?.velocity || 1;
     const begin = t ?? e.whole.begin.valueOf() + lookahead;
-    const end = begin + e.duration + lookahead;
+    const end = begin + e.duration.valueOf() + lookahead;
     const envelope = adsr(a, d, s, r, velocity, begin, end);
     node?.connect(envelope);
     return envelope;
diff --git a/repl/src/CodeMirror.jsx b/repl/src/CodeMirror.jsx
index b58ad75a..a659e3ee 100644
--- a/repl/src/CodeMirror.jsx
+++ b/repl/src/CodeMirror.jsx
@@ -44,8 +44,8 @@ export const markEvent = (editor) => (time, event) => {
   //Tone.Transport.schedule(() => { // problem: this can be cleared by scheduler...
   setTimeout(() => {
     marks.forEach((mark) => mark.clear());
-    // }, '+' + event.duration * 0.5);
-  }, event.duration /* * 0.9 */ * 1000);
+    // }, '+' + event.duration.valueOf() * 0.5);
+  }, event.duration.valueOf() /* * 0.9 */ * 1000);
 };
 
 let parenMark;
diff --git a/repl/src/static.mjs b/repl/src/static.mjs
index 0fc70537..5ae319ae 100644
--- a/repl/src/static.mjs
+++ b/repl/src/static.mjs
@@ -45,7 +45,7 @@ async function playStatic(code) {
         if (!onTrigger) {
           if (defaultSynth) {
             const note = getPlayableNoteValue(event);
-            defaultSynth.triggerAttackRelease(note, event.duration, time, velocity);
+            defaultSynth.triggerAttackRelease(note, event.duration.valueOf(), time, velocity);
           } else {
             throw new Error('no defaultSynth passed to useRepl.');
           }
diff --git a/repl/src/useRepl.mjs b/repl/src/useRepl.mjs
index d48aa141..63ea65bb 100644
--- a/repl/src/useRepl.mjs
+++ b/repl/src/useRepl.mjs
@@ -44,7 +44,7 @@ function useRepl({ tune, defaultSynth, autolink = true, onEvent, onDraw }) {
           if (!onTrigger) {
             if (defaultSynth) {
               const note = getPlayableNoteValue(event);
-              defaultSynth.triggerAttackRelease(note, event.duration, time, velocity);
+              defaultSynth.triggerAttackRelease(note, event.duration.valueOf(), time, velocity);
             } else {
               throw new Error('no defaultSynth passed to useRepl.');
             }