diff --git a/packages/superdough/sampler.mjs b/packages/superdough/sampler.mjs
index 819de3c78..25c34c641 100644
--- a/packages/superdough/sampler.mjs
+++ b/packages/superdough/sampler.mjs
@@ -65,21 +65,22 @@ export const getSampleBufferSource = async (hapValue, bank, resolveUrl) => {
   bufferSource.playbackRate.value = playbackRate;
 
   const { loopBegin = 0, loopEnd = 1, begin = 0, end = 1 } = hapValue;
+  const bufferDuration = bufferSource.buffer.duration;
 
-  // "The computation of the offset into the sound is performed using the sound buffer's natural sample rate,
-  // rather than the current playback rate, so even if the sound is playing at twice its normal speed,
-  // the midway point through a 10-second audio buffer is still 5."
-  const offset = begin * bufferSource.buffer.duration;
+  // The computation of the offset into the sound is performed using the sound buffer's natural duration,
+  // rather than the playback duration, so that even if the sound is playing at twice its normal speed,
+  // the midway point through a 10-second audio buffer is still 5.
+  const offset = begin * bufferDuration;
 
   const loop = hapValue.loop;
   if (loop) {
     bufferSource.loop = true;
-    bufferSource.loopStart = loopBegin * bufferSource.buffer.duration - offset;
-    bufferSource.loopEnd = loopEnd * bufferSource.buffer.duration - offset;
+    bufferSource.loopStart = loopBegin * bufferDuration;
+    bufferSource.loopEnd = loopEnd * bufferDuration;
   }
-  const bufferDuration = bufferSource.buffer.duration / bufferSource.playbackRate.value;
-  const sliceDuration = (end - begin) * bufferDuration;
-  return { bufferSource, offset, bufferDuration, sliceDuration };
+  const playbackDuration = bufferDuration / bufferSource.playbackRate.value;
+  const sliceDuration = (end - begin) * playbackDuration;
+  return { bufferSource, offset, bufferDuration, playbackDuration, sliceDuration };
 };
 
 export const loadBuffer = (url, ac, s, n = 0) => {