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How it's made

Source

three soft mallet-struck tuned bars (felt mallet on a marimba-like tine), played as a slow rising arpeggio. The felt strike is a 6–10 ms low-passed noise puff, not a click.

Body

each note is a sine fundamental plus a weak 2nd and 3rd partial (2.0×, 3.0×) that decay 2–4× faster, so the onset is warm and the tail is pure. A detuned twin (+0.15 %) adds a slow 1–2 Hz beat for life.

Envelope

8 ms soft attack, then an exponential ring of 0.35–0.8 s; the last note rings longest and the notes overlap gently, giving a relaxed ≈ 0.26 s pulse with a total length near 1.2 s.

Intervals

the default stack is an open root–fifth–octave (1 : 1.5 : 2), no third, so it neither resolves nor sounds sad; each step is a little louder and the final note is the brightest.

Variation

`rng` detunes each note by ±0.2 % and jitters timing by a few ms; presets change register, spacing, interval stack and brightness.

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