Hi Marcus,

you could take a look at my modules MIDI::Tools and Music::Gestalt:

http://search.cpan.org/~crenz/MIDI-Tools-0.02/
http://search.cpan.org/~crenz/Music-Gestalt-0.06/

You might also have a use for MIDI::Pitch:

http://search.cpan.org/~crenz/MIDI-Pitch-0.7/lib/MIDI/Pitch.pm

Regards,
    Christian

-- 
crenz@web42.com - http://christian.web42.com - http://www.web42.com/crenz/ 

"A man who gives in to temptation after five minutes simply does not
know what it would have been like an hour later. That is why bad
people, in one sense, know very little about badness. They have lived
a sheltered life by always giving in."  -- C.S. Lewis