I unlocked two things just now: feedback patching in supercollider and screen recording on sway. (audio sync is unfortunately off)
#patchnotes: the code is in the video, I can send a snippet if anyone wants it. Basically, 3 oscillators FM each other in a ring. They're mixed and that's sent through a comparator which pings a filter, which is also mixed with their sum and sent out. The envelope of that final mix modulates the amplitude of 2 of the oscillators and the filter's resonance.