I agree that an easy export MIDI to GarageBand or Logic would attract a lot of Mac users. GarageBand is good, but it can't do what BB does, i.e. generate chord progressions and solos in a matter of seconds. Then from GarageBand > MP3 or ACC > iTunes > iMovie or iPhoto. Would be a great way to make background music for home videos in iMovie or slide shows in iPhoto.