Audacity

I found this Open Source Audio tool. Haven't got any opportunity to try it yet. If someone has can please leave a comment here. (No doubt it must be good;) )

The Free, Cross-Platform Sound Editor

Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. Learn more about Audacity...

And download for Windows here...