I ultimately want to deliver music for playback in iOS games.  I also want to generate printable sheet music.  I'm thinking core audio format makes the most sense for playback unless there is some sort of an open MML playback library for iOS.  In either case, getting MML out of the deal would be fantastic.  What toolchain should I be using?

I've played around with Famitracker, but I will happily switch to something else if it is the wrong tool for the job.  I want to try out MML at some point to see if I prefer it to a tracker.  So far as I can tell, the mml-tracker project is dead.  Also, I'm considering investing in a Korg microKEY.