I designed and built a eurorack module around a pi zero with a usb audio input/output, voltage divider, op amp, and some pots connected to adc. Using rtaudio the latency was pretty low and gave me control of the parameters I wanted.

Given that this was the only really active process on the pi, it ended up working really well. I simply converted modules I had written for vcv rack.

I also built one that enabled usb host mode and acted as an audio device that worked with any daw. Ended up being pretty cool for about $20 of parts.

While not as cool as an ml system, given that I was already writing dsp, it ended up being pretty neat.