@joshua I think it only needs to do 2MHz, so it should be fine for prototyping (I think an Arduino can do 8MHz). I’ll probably need an oscillator for the real deal though.
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Have also ordered a couple of AY-3-8910A ICs from eBay. I’ll probably do some initial prototyping with an Arduino, and then see if I can hook it into a Eurorack form factor.