Using a Raspberry Pi to Add MIDI to a CV Synthesizer

And here&#x27;s a MIDI-to-CV controller built with a $3 microcontroller instead of a $40 computer: <a href="https:&#x2F;&#x2F;github.com&#x2F;elkayem&#x2F;midi2cv" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;elkayem&#x2F;midi2cv</a>

This is super cool! Using an FFT to detect pitch is a natural approach, but my understanding is that most pitch detectors work in the time domain using some form of auto-correlation. See:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Pitch_detection_algorithm" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Pitch_detection_algorithm</a>

Kinda related; software CV done with JACK and LV2: <a href="https:&#x2F;&#x2F;linuxmusicians.com&#x2F;viewtopic.php?f=1&amp;t=20701" rel="nofollow">https:&#x2F;&#x2F;linuxmusicians.com&#x2F;viewtopic.php?f=1&amp;t=20701</a>

Nice. :-) Having done somewhat similar stuff before, I&#x27;m curious if you were able to measure what the latency result of using linux and python was vs doing it with an MCU like a teensy or arduino and using C? I can see advantages to both approaches, and am genuinely curious. There must be some latency and unpredictability added, but maybe it&#x27;s small enough to totally not matter. Off course whether this matters depends too on the controller keyboard and your playing level, I know what is ok to me differs from what what my Real Pianist friends tolerate!

Wow! Great little demo. It sounds like there are multiple synths though -- isn&#x27;t the monotron monophonic?

I created a midi piano in the browser for a Roland EP7 IIe that sent midi note off in a weird way - causing double notes , it would send the same note but with just the velocity information changed to 0, which most midi software didn&#x27;t like.<p><a href="https:&#x2F;&#x2F;htmlgames.github.io&#x2F;htmlgames.github.io&#x2F;htmlgames&#x2F;PF_MIDI_PIANO&#x2F;midi-js_Basic.html" rel="nofollow">https:&#x2F;&#x2F;htmlgames.github.io&#x2F;htmlgames.github.io&#x2F;htmlgames&#x2F;PF...</a><p>So I just held the notes in an array and used that for note on&#x2F;off information instead.

This is great. And miti is exactly what I was looking for. Started working on something similar in bash and perl on top of gbevin&#x27;s sendmidi [1] a while ago, but this looks like it&#x27;ll save me much effort. Thanks!<p>[1] <a href="https:&#x2F;&#x2F;github.com&#x2F;gbevin&#x2F;SendMIDI&#x2F;" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;gbevin&#x2F;SendMIDI&#x2F;</a>

Brilliant trick to self calibrate, these are probably each different enough that if you hooked up another one to the same PI it would come out all out of tune.