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portal64-still-alive/documentation/levels/cutscenes/start_sound.md
Matt Penny f4cb8ddd31 Finish cutscene step documentation
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start_sound

Starts a sound immediately without blocking.

Syntax

start_sound SOUND_ID [VOLUME] [SPEED]

Arguments

Name Description
SOUND_ID The ID of the sound to start. SOUNDS_ prefix can be omitted.
VOLUME (optional) The volume multiplier for playback. 0 is muted and 1 is normal volume. Defaults to 1.
SPEED (optional) The speed to play the sound at. Effectively a multiplier of the game's output sample rate (44100 Hz). Defaults to 1.

Notes

Only 12 sounds can be playing simultaneously. Any sounds started while at the limit are treated as if they have a length of zero.

The game outputs audio at 44100 Hz but most sounds are sampled at 22050 Hz, and so a speed of 0.5 is needed for normal playback in the majority of cases.