I just broke out my copy of Time's Up recently.
In his 1991 Bass Player cover story, Muzz said he was working on a technique where he "strummed" the string with his thumb in an up-and-down motion-not unlike Victor Wooten's double-thumbing. However, in the home video "Time Tunnel', there is some footage of them in the studio playing this song and he is using 2 fingers.
As for the slaps, that always confused me too. When my band did it, I alternated my 1st and 2nd fingers, as in 1212. I wish there was some video footage of that part of the song.
Glad to see there's another Muzz fan out there.
