convert MIDI Sequence to mp3?

iTunes cannot do it. It is possible. The only way I can think of requires expensive pro software, but I'm sure there's a cheap way to do it out there.

 

There's a chance the Quicktime player will do it. Try to open the midi file in the qt player and then under file choose export and see if mp3 is an option. If it's not but aiff is, then do it as aiff and then use itunes to convert that file to mp3.

 

Quicktime will only play it as long as the QT Music Synth is activated, and then only if it's a type 1 MIDIfile, the one that conforms to General Midi.

I'd throw it at Garageband, re-arrange it and bounce it to iTunes.