[CM] linux, midi default player... caution: newbie! :)

[padovani]

Hi,
so... I'm happy that I can listen to all iterations I'm studying on 
"Notes from the Metalevel"... I can hear the examples that begin with 
(events (process-name args) "midifile.mid")...
Now, I'm trying to understand which player cm is using to play the 
midi-events... I can play midifiles only with (play "midifile.mid"), but 
lines like
(oss-play-midi-file file); (set-midi-file-versions! true); 
(set-midi-output-hook! #'oss-play-midi-file) return errors that I just 
can't understand...
I'm using Ubuntu Studio (Feisty, 7.04)...
Thanks if anyone can explain better these things and how portmidi and 
midishare are called/used(?) by cm to play things...
Tx,
José H. Padovani