I do not currently run Linux on my Macbook Pro, more due to lack of time to
really troubleshoot one distro I am interested in myself than anything
else. To be honest I am not sure anything wouldn't work, but haven't run it
myself yet to be able to answer that sorry.
I currently run Jack, Ardour, and a few other Linux programs on the Mac side
of things though. I run Linux exclusively on my workstation(When it is
working, blasted motherboard died right after I paid to upgrade processors,
memory, etc.).
I would imagine(Random guess) the reason none of those programs midi works
is due to they probably all use Alsa midi, which obviously doesn't work on
Mac. But that is something else I haven't looked into. Then again I could
be completely off as well;)
Seablade