The basic steps of vocal removal starts with a stereo version of the song. Then one of the channels is electronically reversed and added back into the other. Anything that is common equally to both channels will cancel out. A vocal is usually in the middle of a stereo song and with a channel reversed it cancels out. The problem is that effects added to the vocals like reverb is done in stereo so that it is not equal in both channels and therefore will not totally cancel out.

If you have access to a small audio mixing console that has balanced audio output you can hook this up yourself. A unbalanced mixer will not work. Balanced audio is where you have a plus wire, minus wire, and a shield. Home audio is unbalnced in that it has a plus wire in the middle of the shield and the shield is the negative signal as well as the shield.

I have done this with several songs for people and have had total success on some songs and others just so-so becasue of the reverb. The good news is, if someone is going to sing over the result of the vocal removal you won't hear the slight bit of vocals. If you want to use this for a dry music bed it will not work, you will always hear just a little of the vocals.