Hi Tony,

In addition to John's excellent advice, you could transpose your tunes in advance, on your computer & then resave them to disk....

When I want to transpose or change the tempo of a midi file, I use vanBasco's Karoke Player...its a free download (approx. 676 Kb) at:
http://www.vanbasco.com

You can also mute or solo instruments with it & plays all midi files in addition to the karoke files....I've used it for a couple of years & have had no problem with it...

When I want to transpose or change the tempo of a Mp3 file, I use the Pacemaker plugin on my Winamp....works great, especially if you're trying learn a particular part of a song or to get the lyrics....

Just another suggestion....

FlutteringBy