See also:
Dave Thomas's
PIC
code
for Midi output
http://daemon.apana.org.au/~ghansper/MidiAxis.html
http://harmony-central.mit.edu
http://louie.udel.edu/pub/midi/software/mac/mac-midi
ftp://cher.media.mit.edu/pub/mainboard/mac
http://www.ee.ualberta.ca/~charro/cookbook/comp/ibm/midi1.asc
ftp://ftp.digex.net/pub/access/rdd/pdp/synth
DEC PDPs and Music/Sound Synthesis Summary
http://www.xs4all.nl/~jwasys/diy4.html