The pots are nothing else than a control voltage (0..5Volt).
It's more a fun toy than a high end synth (and toys don't have MIDI
I've got a Doepfer that has 4x 0..5V CV outputs so I can try to hook that up, cool.
Toys do have MIDI... I'm currently building Highly Liquid kits for my Speaks, my Atari2600 and my SK1.
I never really thought I wanted MIDI because the bent sound is only the 1st stage, everything ends up as audio in Ableton Live and gets sliced/diced/warped whatever some more.... but I saw a vid of a MIDI 2600 and I was like "wow", I think MIDI control will get me to where I want to be sooner.
Hey how about a trigger input (+5v gate pulse?) so the sequencer advances one step... that would work and it would save you a lot of boring MIDI programming...?