Click on the link below and read in the "Flexible and Portable—More Choices for You" paragraph. It says Fast Track Pro is compatibile.
http://www.m-audio.com/index.php?do=...6a5377d29c4eb5
It would be nice if Digi could clarify this once and for all. I don't want to go ahead and settle on the Fast Track USB if I can get the Fast Track Pro.