Is this possible? I wanted a backing track of Miles Davis' "So What", and then saved it as a midi file.

We played the midi file through my keyboard player's Casio but he found that though he could adjust the volume levels of the various tracks or elements in the midi file, he could not change the tempo.

This seemed kind of surprising. Or is it? Or is there some way to unlock the tempo in the midi file?

pete in oakland, ca