Ok so I really like the main bass in this song:

0:53
http://www.youtube.com/watch?feature=player_detailpage&v=jBzZG_vNIcI#t=52s

I've made a scrapyard "screaming" bass in Massive that's holding me over for now, but its just not quite the same.
It sounds like there's vibrato but it makes my patch ...