A minimal, real-time midi synthesizer in Go. Currently connects to a midi device and acts as a sine wave oscillator based on incoming MIDI Note-On and Note-Off messages.
I wanted the basic skeleton of a performant synthesizer to be able to quickly experiment with DSP concepts. Go is a super simple, statically typed language so there's not a lot to hide behind. The dependencies used are also fairly low-level but easy to read and understand if necessary.
I also felt like there were very few simple examples of a fully implemented synthesizer. This shows how the fundamental OS's audio callback buffer can be written into based on incoming MIDI NoteOn and NoteOff messages.
Using "go run":
go run . -ls: Lists all available midi devices
Then using the index printed from the "ls" command to specify a device to use:
go run . -d <index>: this acts as a simply sine-wave synth
go run . -d <index> -m: print the incoming midi messages
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Oto: a fantastic low-level audio library in Go.
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PortMIDI: The PortMIDI wrapper in Go
This does require portmidi to be installed, as mentioned in its Readme,
apt-get install libportmidi-dev # or brew install portmidiOr get it from the source: http://portmedia.sourceforge.net/portmidi/
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How I built an audio library using the composite pattern and higher-order functions: I really like the author's compositional approach to building an audio library and definitely pulled from it here.