ATtiny85-based MIDI synthesizer
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Synth Cable: ATtiny85-based MIDI synthesizer

This is the source code to my original Synth Cable using an ATtiny85. It's also identical to the code that runs on my World's Smallest MIDI Synthesizer and almost identical to that used in the Hardware Reverse Oscilloscope.

It has a monophonic square wave output and supports an arpeggiator, modulation/aftertouch and pitch-bend.

Schematics and explanation here:

Video demos:

Code last modified 5th Aug 2015.