The Amazing Slowdowner
The Amazing Slowdowner is an audio tool for changing the speed and/or pitch of a recording. Most people use the Amazing Slowdowner to help learn songs by slowing them down, but the tool is also a great for testing your own tunes at different tempos. we like this app a lot. http://www.ronitmusic.com

Bob Sellon: Update 11-24-2007: I recently upgraded my developement PC to a Vista system and have encountered problems with The Amazing Slowdowner. This is an older version of the app (V2.81) but I contacted RoniMusic to see if they could provide any suggestions on how to get this version working. Their reply was that I need to upgrade to the tune of about $30. I'm a little hesitant to bite since they are clearly only providing limited support and the feature set is rather limited even for the original price.