It's been suggested in this thread long ago but I couldn't seem to reply to that thread anywhere. I think this would be a great addition to the Music Production Suite.
From the website:
MilkyTracker.netMilkyTracker is an open source, multi-platform music application for creating .MOD and .XM module files. It attempts to recreate the module replay and user experience of the popular DOS program Fasttracker II, with special playback modes available for improved Amiga ProTracker 2/3 compatibility.
Website was down last time I check a few months ago, but I checked again tonight and it seems to be up and running again.
Program: MilkyTracker
License: Open Source (specific unknown)
Description: "Old School" style music sequencer (otherwise known as a "tracker")
Website: http://www.milkytracker.net
Other: Seems to be inherently portable, stores settings in milkytracker.cfg in program directory.