Polyphonic Synth Cable

This is the fourth synthesizer cable I've built, the first three being based on the ATtiny85. I have been looking into ARM chips but haven't gotten to grips with them just yet. Instead, I decided go back to the ATtiny2313, which has a quarter of the memories of the tiny85, but a hardware UART port and more pins. It's quite a simple idea really - generate square waves by toggling the digital outputs on many ...

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