U need to set it to 100% to remove the vocal, but sadly, you cannot save it
To save, use windows recorder, or try figure out better way, coz i have no better idea

I've read on it in some games magazine, and here I am

Try to change key settings, f.e. to 1, 2, 3, 4, 5 instead of f1, f2, f3, f4, f5

http://www.analogx.com/contents/download/audio/vremover.htm This is plugin for winamp, which allows to remove vocal from songs, and leaves most of guitar and drums. Works best on metal songs. I tried it with slayer, soad, cob, and it works perfectly, only rhcp's songs were messed. Hope that helps, ...