Using a Raspberry Pi to add MIDI to a CV synthesizer #PiDay @Raspberry_Pi @yakczar
Zack programmed the Raspberry Pi to control voltage and respond to MIDI to can play the Korg Monotron with a keyboard. Korg has developed this little synth with hacking in mind. The tutorial shows you how to use a Raspberry Pi as a cheap MIDI-to-CV controller so you can use the Korg Monotron just like any other MIDI instrument.
The magic trick here is that I added a tuning function into the Raspberry Pi (in midi2cv.py) so you can automatically determine the relationship between voltage and frequency to tune any CV synth. It works by connecting the audio output of your synth to the Raspberry Pi (via USB audio connector) and then computing the FFT to find the fundamental frequency of tones controlled by various voltages.
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