Naturally, I'm a little behind. I've been trying out Haiku recently and just found out about Milky Tracker being available on Haiku. I was running Haiku alpha 4, but switched to a nightly (r45686) before downloading Milky Tracker. It runs great on Haiku, and reminds me very much of FastTracker II. But someone should post an entry for Milky Tracker on Haikuware.com.