Lay a sound pass under the trailer's picture.

Lays a sound pass on the trailer's master in the background: an ambience bed under every beat it plays (one bed carried through beats in the same place) and the few spot effects its picture shows (a door, a mug set down, footsteps), designed from its sound map and placed on the timeline's sound-effect lane — each reused from the writer's sound bank or made. Every level is set against the film's dialogue (a bed about 12 dB under it, a spot about 5 dB under it), no spot lands inside a spoken line, a cue whose file came out too quiet, clipped or gappy is made again once, and the master is then re-stitched (by the score's own re-stitch when a score is still being composed). It designs around the sounds already placed and never removes one. A story film's first master gets one by itself. Free. Refused with a 409 while the cut has no master or a pass is already being laid. Read its progress with GET. Requires Idempotency-Key. Scope: story:write.