diff --git a/packages/core/controls.mjs b/packages/core/controls.mjs
index 5f38d393a..208b5ae52 100644
--- a/packages/core/controls.mjs
+++ b/packages/core/controls.mjs
@@ -193,16 +193,34 @@ const generic_params = [
    */
   ['end'],
   /**
-   * Loops the sample (from `begin` to `end`) the specified number of times.
-   * Note that the tempo of the loop is not synced with the cycle tempo.
+   * Loops the sample from `loopBegin` to `loopEnd`. If one or both of those are set,
+   * the sample is looped to fill the event duration, instead of playing the whole sample.
+   * If only `loopBegin` is set, `loopEnd` defaults to 1.
+   * If only `loopEnd` is set, `loopBegin` defaults to 0.
    *
-   * @name loop
-   * @param {number | Pattern} times How often the sample is looped
+   * @name loopBegin
+   * @param {number | Pattern} position position from 0 - 1 where the loop starts
    * @example
-   * s("bd").loop("<1 2 3 4>").osc()
+   * note("<c a f e>").s("piano")
+   * .loopBegin("<0 .24 .32>").loopEnd(.5)
    *
    */
-  ['loop'],
+  ['loopBegin'],
+  /**
+   * Loops the sample from `loopBegin` to `loopEnd`. If one or both of those are set,
+   * the sample is looped to fill the event duration, instead of playing the whole sample.
+   * If only `loopBegin` is set, `loopEnd` defaults to 1.
+   * If only `loopEnd` is set, `loopBegin` defaults to 0.
+   *
+   * @name loopEnd
+   * @param {number | Pattern} position position from 0 - 1 where the loop ends
+   * @example
+   * @example
+   * note("<c a f e>").s("piano")
+   * .loopBegin(.2).loopEnd("<.3 .4 .5 .6>")
+   *
+   */
+  ['loopEnd'],
   // TODO: currently duplicated with "native" legato
   // TODO: superdirt legato will do more: https://youtu.be/dQPmE1WaD1k?t=419
   /**
diff --git a/packages/webaudio/webaudio.mjs b/packages/webaudio/webaudio.mjs
index 1f4e3375d..fc0280040 100644
--- a/packages/webaudio/webaudio.mjs
+++ b/packages/webaudio/webaudio.mjs
@@ -231,7 +231,8 @@ export const webaudioOutput = async (hap, deadline, hapDuration, cps) => {
     unit,
     nudge = 0, // TODO: is this in seconds?
     cut,
-    loop,
+    loopBegin,
+    loopEnd,
     orbit = 1,
     room,
     size = 2,
@@ -307,17 +308,21 @@ export const webaudioOutput = async (hap, deadline, hapDuration, cps) => {
       // are there other units?
       bufferSource.playbackRate.value = bufferSource.playbackRate.value * bufferSource.buffer.duration * cps;
     }
-    let duration = soundfont || clip ? hapDuration : bufferSource.buffer.duration / bufferSource.playbackRate.value;
+    const loop = loopBegin !== undefined || loopEnd !== undefined;
+    let duration =
+      soundfont || clip || loop ? hapDuration : bufferSource.buffer.duration / bufferSource.playbackRate.value;
     // "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 * duration * bufferSource.playbackRate.value;
     duration = (end - begin) * duration;
     if (loop) {
+      loopBegin = loopBegin ?? 0;
+      loopEnd = loopEnd ?? 1;
       bufferSource.loop = true;
-      bufferSource.loopStart = offset;
-      bufferSource.loopEnd = offset + duration;
-      duration = loop * duration;
+      bufferSource.loopStart = offset + loopBegin * duration;
+      bufferSource.loopEnd = offset + duration - (1 - loopEnd) * duration;
+      duration = hapDuration;
     }
     t += nudge;