lab_bind_audio

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Bind the project's generated audio to a sequence's tracks — ONE call that does both halves of the job, because doing only the first half silently produces a silent film. Half one (`POST …/soundmix`) creates the four empty tracks (dialog, music, sfx, atmo); half two (`POST …/soundmix/resolve-stems`) is what actually attaches the audio rows to them. On 2026-08-28 that split cost a complete silent export: the mix looked configured, and every track was empty. From here it is one tool, and it is idempotent — an existing mix is NOT re-initialised (that would throw away volumes, effects and the other tracks' bindings), only re-resolved. Per track it takes the audio row marked `selected`, otherwise the newest one with a url. Rows still pending have no url and stay unbound. That choice is re-made on every call: generate a second music track and run this again, and the music track follows the NEWER row — unless one row is pinned with `selected`, which is set in the web UI, not from here. Changes state, costs nothing. Next: lab_beatgrid.