"Jean-Claude Risset’s harmonic arpeggio is a spectral composition technique that uses sine wave interference patterns. This technique allows you to create beautiful drone-like sound, over which occurs a downward cascading arpeggio of a specified subset of the harmonic series. The instrument’s timbre is similar to the sound produced by an overtone singer. Created by beating patterns that result from closely-spaced sinusoids (i.e. slightly detuned sine waves), Risset described the arpeggio gestures as 'spectral scans'"
You can find the code and additional details on Sample Me.
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