how can you mute out the artist voice and use your own?

Answer 1

You can't do this with a normal audio track, it needs to be a MIDI or split track.

On an audio track all the vocals and instruments are recorded as one enitity. With a MIDI track each component is seperate, so you can remove vocals or specific instruments, etc.

Answer 2

get one of those karaoke Cds....

then play the music, sing along, while at the same time record it all separately