In the win version there is a "avoid transpositions in realtracks" in the song settings if you have that in the macintosh you can try it or what Noel said.

You can also make a copy of the real track folder
now don't know what daw's you have but you can try a 12st transpose
of all the m4a files - you will still have a copy of originals if it sound really bad.

This is a very cheap handy tool http://rubberbandaudio.com/ just drag the file in change to pitch to +12 and drag out - it should drag out as a wav or a aiff that band in a box would use.