@tehn – it’s a great machine once you get it up and running, which can be admittedly fiddly. But it’s basically rock solid after that.
I simply run the windows editor inside of a virtualized windows environment. In this case I’m using parallels, but virtualbox would work as well I’m sure (if you’ve not already purchased parallels/vmware).
I run the app in windows 95/98 compatibility mode which seems to help.
The editor itself is super light weight so even if you have a tiny VM you should be fine.
It can be particular about your midi interface as well. There are lists of working ones on the emusic forums somewhere, I use an old midisport 4x4 which chugs along merrily.
There’s an OSX editor that someone wrote in java but I could never get it working and I already had the windows VM around for certain audio software anyway.