I took the "Risset Harmonic Oscillator" instrument I designed for the Nebulae nodule and ported it to work in the context of DocB's great Csound module for VCV Rack, aka dbCsound. This is a great way to prototype Csound code. NB: this requires v2.0.5 of dbCsound, which has not yet been released in binary form (but is available as source.) This version of the instrument has slightly different features compared to the Nebulae version.

The instrument generates audio output using Risset's harmonic arpeggio technique. The controls are mapped as follows:

P1: spread, i.e., the distance between the individual tones that are combined to make the output

P2: waveform, morphs through a series of waveforms: triangle, saw, square, prime, and fibonacci (the last two are my design)

P3: distortion, using tanh distortion via the distort1 opcode

P4: tremolo pan, which is effect I came up with that applies two separate LFOs to the left/right outputs; this control sets the LFO speed

The control inputs IN1-4 apply to these controls. They expect a 0-10 (unipolar) input voltage.

https://github.com/DaveSeidel/music-src/blob/master/Nebulae/instr/Risset_Harmonic_Oscillator/dbRackCsound/risset.orc

I am considering trying to write a native VCV Rack module based on this design at some point.

- Dave