A song that had been played a few times in a long session stuttered at regular intervals until the page was reloaded. A quick run up the keys of a sampled instrument made every sound drop out for a second or two. Both came from work the audio thread should not have had. - Every worklet node of a voice listened on its port. Chrome never collects a port that is listened to, and through its listener not the voice either. Every node of the voice stayed on its bus and was worked on in every block. A way or stage on the worklet now closes its port once it ends or is stopped, and the processor closes its own side when it is told to stop. - A voice without echoes now leaves its bus as soon as its sound and what its stages hold back are through. Before, only a voice with echoes did. - At most 12 ways play through the pitch worklet at once. One more cuts the oldest in 10 ms, a note already let go before one still held. Each runs a phase vocoder, whose first block alone took 2.7 ms of the 2.67 ms a block has on stein2. - Play for the game ends everything the tabs play: the piece holding the transport and every key or preview (`stopPreviews`). - Closing a Sound, Sound FX, Instrument, Pattern or Song tab stops what it plays of that asset (`AssetTabEditor.closed`). - A preset in the Instrument tab plays nothing any more. With Audition on it is heard like any other change. - Test hooks: `__gm.instrument.play`, `__gm.sound.playing`, and `vocoders` in the stats of the sound library. Measured: - A copy of the project, its Song 2 played for 12 s and stopped, six times (Chrome on stein2, CDP WebAudio): before, 746 nodes were left after the first time and 4469 after the sixth, the load at rest grew from 0.01 to 0.06. After, 7 nodes are left every time (the master and one bus) and the load at rest stays at 0.01 to 0.02. - Pitch-player voices live in Chrome on melektaus-atx: 12 take 0.50 of the audio thread, 16 take 0.71, 24 take 0.99. 30 struck 40 ms apart held it at 0.99 from the first second on. Tests: - Unit sound-library: 110 green (3 new), 4 counter-probes each red - e2e 34 (melektaus-atx): ALL PASSED, 86 checks (3 new, 2 changed) - e2e counter-probe with game start and preset undone: their 3 checks red, and the old check of Play note in the game as well, which now counts on the preview being gone - e2e counter-probe with tab close undone: exactly its check red. A first form of it held a key and stayed green, since the keys let go of a held key by themselves once the tab shows no asset - Gate (melektaus-atx): 270 files, 4181 tests Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>