This is great - thanks for the link. I've just started out with my Axoloti and I'm definitely going to try and hook it up to a Serge synth at some point. Why did you go for the external adc rather than the built in ones by the way? Did you need more than were available? As far as I understand you're more limited that way as they aren't clocked as fast. I was just thinking of using opamps to attenuate and offset the modular signal, then send it into the gpios. Is there a good reason for not doing this?