lab_mix

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Set the sound mix of a sequence: per track `volume_db`, `pan`, `mute`, `solo` and `effects`. Every field you send is rendered — the backend rejects what it cannot render (422 with the reason), so a saved mix is the mix you hear. Tracks are the stems `dialog`, `music`, `sfx`, `atmo`, plus `master` (effects only: eq, compressor, limiter). Only the fields you send change; `effects` replaces that track's whole effect list. Effects: gate, eq, deesser, compressor, reverb, limiter — fixed order, one of each per track; give a `preset` (with its written reasoning), a one-knob `knopf` (0–1) or explicit values. Ducking is an effect too: {type:'ducking', quelle:'dialog', amount_db, attack_ms, release_ms} lowers this track while `quelle` is active. `naht_ms` (0–500) fades every seam between the clips of a stem with an equal-power fade — against clicks and room jumps at the cuts of a stem built from pieces; 0 = hard edges. The sfx stem of lab_ton_durchlauf comes with 30. Volume `automation` replaces the track's breakpoints {t_s, db}, in seconds from the sequence start, interpolated linearly in dB; [] clears it, and master does not support it. Call with `katalog: true` (and no tracks) to get every effect, its ranges and the presets with their reasoning. Any change discards the rendered mixdown. Changes state, costs nothing. Next: lab_mix_render, then lab_mix_messen.