Interface NoiseOptions

Attack time in seconds — linear ramp from 0 up to gain. Clamped to [0.001, duration / 2]. For very short durations (< 2 ms) the upper bound wins so the envelope still fits inside the playback window. Defaults to 0.005.

Seconds to wait before the sound starts, scheduled on the audio clock rather than a timer. 0 (the default) plays immediately.

This is what sequences a multi-part sound — a stinger's second note, an explosion's double-tap — and it is sample-accurate, which setTimeout is not: a timer fires on the main thread, so a busy frame slips the note audibly. Nothing is allocated until the sound actually starts.

Total burst length in seconds (envelope decays over this window).

Optional NoiseFilter applied to the noise source before the master gain. Use this to colour the noise — a lowpass on brown noise gives "explosion thump", a highpass on white gives "hi-hat tick", a bandpass gives "swoosh".

Frequency multiplier applied to NoiseFilter.frequency over duration as an exponential ramp. 1 = no sweep (default); >1 = filter opens upward (rising swoosh, laser pew); <1 = filter closes downward (descending thunk, explosion settle). Has no effect when filter is unset.

Peak gain at attack end, 0..1. Defaults to 0.1.

Stereo pan, -1 (full left) to 1 (full right). Defaults to 0.

Spectral colour of the noise source:

• "white" — flat, all frequencies equal (default).
• "pink" — −3 dB / octave roll-off, perceptually balanced — classic for breath, wind, and acoustic-sounding ambient texture.
• "brown" (red) — −6 dB / octave roll-off, low and rumbly — classic for distant thunder, ocean, low-fi rumble.