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How it's made

Source

a two-note arcade confirm blip. Each note is a band-limited pulse plus a detuned saw (the "synth lead"), a sine one octave down for punch and a 2 ms high-passed noise tick that makes the strike feel hit.

Body

a low-pass filter opens from ~1.2x to ~6x the note pitch within 60 ms and then closes, so the spectrum moves from bright attack to a round tail; a slight 15 ms pitch scoop (3 % up) gives the note snap.

Envelope

note one is short (~70 ms), note two a fifth higher rings ~160 ms; both start with a 2 ms ramp so there is no click. The second note is then repeated as a tape-style echo: 1-4 taps 70-200 ms apart, each softer, darker and alternately panned, so the whole gesture is about 0.6 s.

Variation

`rng` detunes each voice by under 0.3 %; pitch, interval, echo count and spacing, brightness and ring set the character; presets move between a bright arcade, a soft handheld and a big hall-style attract-screen confirm.

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