As a straight ahead audio editor, Soundtrack Pro does excatly what I need and is the best sound editing software currently available for the Mac, in my opinion. I use it daily for multi-track recording and wave form editing and since it integrates both nicely I give it the highest rating. I may not have to use 50+ files like the video editors, but Soundtrack Pro has never failed me. And since I work strickly in a radio broadcasting environment it's the one to use. So until Adobe releases a verion of Audition for the Mac (doubtful), Soundtrack Pro will be my AUDIO editor of choice.