I actually have this file you speak of, and yes, it is in this song. In case anyone cares, this voice part is played by (insert some instrument that I cannot name here) that comes in at about 1:33.
I kinda hate to say it, but I'm not hearing any kind of remix here, just additional background parts. As to if that still counts or not, I don't know.
In any case, good stuff. 9/10