demo.lens.sound — the soundtrack, on the film's clock

Three layers, cued three different ways.

Beds. Rain outside, rain heard through a wall, wind, the gas, the room itself. Looping sources whose level is a pure function of film time and of INSIDE, the one number that says how far into the building each shot is: 0 is the vale in the rain, 1 is the middle of the mortuary with the door shut. It decides what the rain sounds like, whether the gas is audible, and whether there is a room at all. After the strike the door stands open and the vale comes back in through it.

Score. Nine sustained tones loop forever and this module holds each one's LEVEL as a ramp over film time. That is why the harmony can arrive, tighten and be cut off dead at 58.40: a level is on the film's clock, and a stem playing through is on the wall clock, and a rendered frame is not a wall-clock frame. Movement I is a low D pedal under the vale; movement II brings the minor third in at the first interior and tightens to a cluster; movement III is hollow — an open fifth high up, and the pedal returning to go out with the storm.

Cues. 76 one-shots at exact film times. Thunder is the whole point: a stroke at 3.09 km is heard 9.01 s later because its cue sits at film.thunderAt(i) and nowhere else. Stroke 1 fires at t = 2.00 and is heard at t = 11.01; stroke 12 takes the spire and is heard at t = 58.40, the same instant. Stroke 15's thunder would arrive at 97.90 s, after the film has ended, and that silence is the storm having gone.

local sound = require("demo.lens.sound")
sound.cues()          -- every one-shot, in film-time order
sound.status()        -- the cursor, the next cue, any missing clip
sound.missingClips()  -- what the world does not have

Cues fire when the clock crosses them. A seek re-arms rather than firing everything it skipped, so run() from the top sounds the same every time and seek(t) paints a frame in silence.

Spatial hosts ride the entities they are the sound of — Bell7, MortuaryDoor, Lantern — and the footstep host walks the aisle and then the avenue, so a bell heard from the west end of the mortuary is on the same side of the frame it is drawn on.