by Lee Restarick » 04 Mar 2013, 22:26
Nice find Ecca, it's very eery isn't it. I would guess the vocal has been isolated using the same phase process as used removing Hank from stereo tracks, but doing the opposite. You could be left with just the backing track and and also vocal only. The vocal would then be manipulated in melodyne or autotune. I would guess instruments in the backing track, from what I can remember, are heavily panned left and right, so you could perhaps isolate instruments further. Not sure how the piano chords were changed from major to minor though.