Noise Swells

How it's made

Source

continuous low-speed air turbulence, modelled as independent pink-noise fields, not a voice.

Body

a centred 65-850 Hz pressure bed supplies warmth; diffuse air above 220 Hz opens gently with each swell. Cascaded low-pass filters (Q 0.65) remove upper hiss without cavity tones or whistles.

Envelope

a raised-cosine rise occupies 40 percent of each 6 or 12 s cycle; the longer 60 percent fall suggests relaxed release. Slopes reach zero at crest and trough; a quiet floor avoids gating.

Modulation

the same envelope drives amplitude and upper cutoff, so faster airflow is also brighter. The pressure bed moves less deeply than the air layer, retaining warmth between swells.

Space

a shared centre and independent left/right air streams create stable, adjustable diffusion; no delays, reverb, tonal oscillators, impulses or random panning distract from the slow breathing.

Variation

named seeded streams preserve repeatability. Deep rest uses one dark 12 s wave; paced breathing uses two clearer 6 s waves; soft tide is wide and shallow; close breath is warm and narrow. The 12 s default holds whole cycles for either rhythm; the renderer crossfades stochastic boundaries.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.