Skip to the middle if you don't want to hear the synth-y stuff. He explains how each section controls a separate overtone.
https://www.youtube.com/watch?v=dJYB02J4a2w
This is exactly what my SR engine does, but with Analog circuitry. Some of the overtones he made even sounds like when you turn my SR engine up. Skip to the middle if you don't want to hear the synth-y stuff. He explains how each section controls a separate overtone.
