to permanently change voices for the 7k:
load the midi, start to play so are past the setup measures, pause, go to mixer, multitrack screen, sound button, track button and change the voices as required. Now got to program menu, sequencer, panel write, ok. Now just save (in a different place to keep your original), sd sound, panel header on, save as gm2.
To permanently transpose midi, menu, sequencer, range edit, transpose, track ALL, 1st measure 1, last measure 200 (any number bigger than the midi), put in your semitones, e.g. +3, OK. Now reverse the drums by changing ALL tracks to track 10 (or whatever the drums are), and the transpose back to e.g. -3, OK.