I’ve been playing around with libfluidsynth which is a software MIDI synthesizer. The nice part (for me at least) is that it can play notes without any additional hardware and the software setup is simple once you get libfluidsynth and a soundfont installed.
I’m finding that I don’t have time to do justice to a music library in Elixir and I don’t think that I have the musical background to do it anyway. It has been a lot of fun, though, so I packaged up the raw MIDI interface and posted it at midi_synth | Hex.
The library doesn’t have a sequencer. You just give it MIDI commands and it immediately runs them. Thanks to Elixir’s binary syntax, this is actually not too bad to work with. There is some example code to get you started. Please read the README.md for getting libfluidsynth and a soundfont file.
