Upward Arpeggio Flourish

How it's made

Source

a polysynth voice playing a fast ascending arpeggio. Each note is two band-limited saws detuned by ±6 cents (analog-style chorus) plus a sine one octave up for shimmer; no sample-and-hold, no noise.

Body

a resonant low-pass per note whose cutoff sweeps from about 5× down to 1.5× the note frequency in roughly 0.18 s, the classic "pluck" spectral movement: bright attack, mellow body. Q stays below 2 so nothing rings harshly.

Envelope

a 3 ms attack avoids clicks, then an exponential decay of 0.15–0.5 s per note. Notes are 55–90 ms apart so they overlap into one rising gesture, and each note is slightly louder than the last.

Echo

three feedback-style taps at one, two and three delay times (about 0.2 s), each −9 dB quieter and darker (low-pass 7 kHz, 4.5 kHz, 3 kHz), like a tape echo; the final envelope closes the tail at about 1.2 s.

Variation

`rng` detunes each note by a few cents and jitters its timing by ±2 ms. The scale (major, minor, lydian), root, note count and spacing change the arpeggio; notes pan gently left to right.

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