An Organelle version of the Critter & Guitari Septavox synthesizer. This version has 4 instances of the synthesizer, each slightly detuned for a chorus effect. Based on this Pd object:
https://github.com/owenosborn/Septavox_pd
Aux button selects play mode. Knob 1 controls waveform, knob 2 controls tuning, knobs 3 and 4 change depending on the mode.
This is great.