I have a fancy cassette player that has this, and i used it constantly. That was early 90's technology. I'd like to assume its not asking too much for something like iTunes, or a 2013 iMac. Basically, i just want to (quickly/easily) slow down or speed up a song... to adjust the mood, to play along with my guitar, etc. I know Audio Hijack will do this, among other things... neat program, but right now i don't need to spend $50 to do what my ancient cassette player would do. Is there something simple (read: cheap/free) that will do this?