There ought to be some cross-over between a MIDI arranging program and a tracker. It's probably just from using it for so long, but I think the ScreamTracker interface beats the crap out of, say, Cakewalk.
I basically want ImpulseTracker with MIDI in/out capabilities. I wonder if adapting the core of the Linux SoundTracker to a new interface and MIDI would be viable. I miss tracking :( I can't do it in Linux or Windows 2000.