Pretty niftly little tool, allows you to record and edit audio. Not just the basics, everything. It's free too, here's the link http://audacity.sourceforge.net/
Happy editing! (note, the only common file types it can use are mp3 and WAV, so covert your audio files with something like itunes if you need to)
Here's something I did with Orinoco Flow. http://media.putfile.com/wolF-oconirO
I reversed it and played it at double speed with a .2 second delay single echo with a decay factor of .5.