The bastard arpeggiator is based off the standard quasi-random melody generator circuit, which works by a mixture of multiplexing three oscillators, a decade counter and general misuse of logic chips.

My version differs slightly from the regular circuit in that I've added a hand-rolled vactrol hooked up to yet another oscillator in order to give more variety to the output signal.

Bastard Arpeggiator

The nullPainter Drone I is a four-oscillator drone synthesizer, driven by PureData Vanilla and running on a Raspberry Pi 4 Model B.

Code and more details are available at my Github repository:
https://github.com/nullpainter/drone

Video of the synth in action:
https://www.youtube.com/watch?v=A3pWmTlM0MA

Sample 8

Sample 7

Sample 6

Sample 5

Sample 4

Sample 3

Sample 2

Sample 1

Circuit bent Cookie Monster toy with additional oscillator, variable adjustment for pitch and oscillation, and momentary oscillator and standard effect switches.

nullpainter

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