Audacity is free and fairly simple to use -
http://audacity.sourceforge.net/
(give the beta version a miss tho)
I downloaded WavePad yesterday with about 5 other audio editing apps from the same people. It's free and looks like it has potential but I haven't played with it too much yet -
Download Audio Editing Software for Windows
I downloaded Reason from Propellerhead software years ago (off WinMX I think). Totally blew my mind but I'm sure if you spent some time with it, you could get to grips with it. Not free
(search for torrent) -
Propellerhead Software
Hope that helps
