MIDI support

[DanChristos]

It would be amazing to have a MIDI out.
This could be useful in so many ways, for example to assign my own sounds and control parameters etc.

I haven't looked into the code ( I don't have even a scrap of experience with C++ unfortunately) but I imagine that it wouldn't be too difficult to generate MIDI data instead of audio at the point where the sound is synthesized.

Anyway, just putting it out there. Thanks to HackerPoet for this amazing software! And to all others who have or will contribute.