overtone/midi-clj — pull request #1 by damionjunk (2011-12-23 00:15:14+00:00)
Title: Added symbol return to midi events, added alternate note-off logic.

After looking in the other branches, it looks like some of this was added there. The logic regarding the alternate MIDI handling for NOTE-OFF events was not however, and is still valuable.

http://www.jsresources.org/faq_midi.html#no_note_off

I was seeing this behavior with my MIDI device - (note-on + velocity 0) == (note-off).