Ambisonic setup skipped when replaying an already-playing sound

[ctoth]

Summary

Ambisonic/positional-FOA spatialization is set up only inside the if (!sound.isPlaying) branch, so replaying an already-playing key with upmix: "ambisonic" never gets a spatial renderer and stays flat until a follow-up Update.

Details

src/audio/MediaService.ts:332-354 — the whole if (data.upmix === 'ambisonic') block sits inside if (!sound.isPlaying):

if (!sound.isPlaying) {
  const [playback] = sound.play({...});
  ...
  if (data.upmix === 'ambisonic') {
    const inputChannels = this.resolveAmbisonicInputChannels(sound, data);
    const target = await this.resolveAmbisonicTarget(sound, soundKey, data);
    if (inputChannels === 4) { await this.configureAmbisonicPlayback(...); }
    else { await this.configurePositionalFoa(...); }
  }
}

If play() is called for a key whose sound is already playing, the outer guard is false and the ambisonic setup is skipped entirely, so the sound remains non-spatialized. Only a subsequent Update (:384-391) recovers it.

Fix direction

Move the upmix === 'ambisonic' setup out of the !sound.isPlaying guard, or (re)apply the renderer whenever the payload requests ambisonic regardless of current play state.

Verification

Read src/audio/MediaService.ts (play) end to end.