Wavetable music player
This is pretty much a direct port from the music player
on this page for
the ATMEL ATTINY45.
Midi player
There are currently several severe limitations...
Only one voice (sounds something like a vibraphone).
Doesn't decode the tempo, you have to manually set it.
Only works with level-0 Midi files, a basic type with only one
track.
Has only been demonstrated to work with the two attached midi
files