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How it's made

Source

two layers. A soft air swish, as of a sheet of paper sliding past, is pink noise; the tone is a small soft-struck bar or bell, a sine fundamental with weak, quickly fading upper partials.

Body

the swish is band-passed (Q ≈ 0.9) with a centre that rises from ≈ 500 Hz to 2–4 kHz and then settles, so brightness moves with the motion. The tone sits at 440–1200 Hz: fundamental, a 2.0× partial (decay 40 %) and a 3.0× partial (decay 15 %), each detuned by a fraction of a percent. A tiny upward pitch glide (≈ 1.5 % in 25 ms) makes the onset feel intentional.

Envelope

the swish swells over ≈ 35 % of its length and falls away by 0.12–0.45 s. The tone starts at 0.09 s, before the swish peaks, with a 6 ms soft attack and an exponential decay of ≈ 0.38 s (60 dB), which is the gentle tail.

Variation

`rng` shifts the tone pitch by ±0.5 % and the swish peak time by a few percent; parameters set pitch, swish level, brightness, tail and swish length; presets move between airy, bell-like and quiet.

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