Hrmm.. I dunno.. get a decent recording app maybe, then you can fiddle around with the mix a lot more than with Audacity which is pretty basic. You really can't go wrong with Reaper. It's not only free for non-commercial use but the download is about 3.4mb, which is tiny when you think about most apps these days.. I mean.. that is half of the download size for Firefox 3...

Reaper Download Page