How to...

How can I remove vocals and sound effects from a stereo track? I know it’s possible to do so, I’ve seen the finished results of just music, with the vocals and the sound effects completely removed, but the people doing this refuse to say how they do it and what program they are using, so I’m just wondering if anyone here can help me do this on Audacity if possible or if there is another program that this can be accomplished in… this would be much appreciated. I don’t care how expensive the program is or anything, just please help if you can.

http://audacityteam.org/wiki/index.php?title=Vocal_Removal