lab_generate_music

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Generate a MUSIC track for a project (Stable Audio via fal.ai) — the first step of the rhythm chain, and the only one that costs credits. ASYNCHRONOUS: the call returns immediately with a row whose `audio_url` is null and `metadata.status` is 'pending'. Nothing is playable and nothing can be bound yet. Poll lab_list_audio (audio_type 'music') until that row's status is 'completed' and audio_url is set — usually under a minute, and the backend gives up after five (status turns 'failed', metadata.error carries the reason, and the credits are refunded). PUT THE TEMPO IN THE PROMPT if you intend to cut on the beat. This is measured, not assumed: a soft swing track measured at confidence 0.164 (unusable), an ordered hard pulse ('techno, 128 bpm, four-on-the-floor') at 0.621. The tempo detector is autocorrelation over an onset envelope — it finds a hard pulse and shrugs at drone, ambient and rubato. Then: lab_bind_audio, lab_beatgrid, lab_apply_rhythm.