Volume warp on sampler scheduled playback

[bhdoggett]

Hi, this is more of a "help" request. I'm trying to record the start and duration times for a sampler playback in a drum machine / sampler app I'm trying to build. For some reason when I have more than one playback instance, the volume gets warped to increase volume at the beginning of the transport loop and lower volume at the end. I'm at a loss trying to figure out where this is coming from.

Here's my sandbox:
https://codesandbox.io/p/github/bhdoggett/drum-the-jukebox/draft/heuristic-sea?workspaceId=ws_76iJDTbHwFwg7RaTf2o52x

and here's my code where I schedule the sampler to play:

  useEffect(() => {
    if (isPlaying && sampleData.times.length > 0) {
      sampleData.times.forEach(({ startTime, duration }) => {
        if (duration) {
          Tone.Transport.schedule((time) => {
            sampler.current?.triggerAttackRelease("C4", duration, time, 1);
          }, startTime);
        }
      });
    }
  }, [isPlaying, sampler, sampleData]);

Could anything in the transport loop be adjusting gain over time, or will multiple scheduled triggerAttackRelease events effect the volume of those events gradually?