Allright, I found the MidiPlayer sample project in the SDK; and when I plug my files in there, actual sound comes out. In the code, track 10 is mapped to a drums instrument. Is it convention in midi-land that track 10 is a drum track? Or was this sample project written with the bundled giveyouup.mid in mind?
The result is very rough/ old-skool though, because all tracks in the midi file, a saw-tooth instrument is created. The style actually suits the final countdown song, but in garageband, the cgmusic file sounds considerably richer
So it seems playdate needs to be told what instruments to use for each track though. Using track:getInstrument() returns nil initially after loading the midi file. GarageBand does an excellent job of gathering that info from just loading the file tho. So I guess the playdate sdk doesn't read that information.
Are these mappings available for playdate as well?