I stumbled across a MIDI site which seems to have loads of info aimed exclusively at Macs.
Macintosh MIDI User's Internet Guide - Information and Links for the Mac MIDI Musician
http://www.aitech.ac.jp/~ckelly/mmuig.html
I'm not a Mac user but it seems to have stacks of the right sort of help. I do note however that some of the links specified are no longer active. Hope this helps.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.
sj