Moving mid-range reece/growls with envelopes?

[axolotl-dubstep]

How are the envelopes or lfo's
put together to create the
movement of bass in this track
Noisia - Poison Theme.
www.youtube.com/watch?
v=aAxGngTlONk
I can make a descent reece and
get it to move nicely but cant get
the aggressive flow like the track
above.
Can someone who genuinely
knows please break it down?
Thanks in advance : )

[Dahneboy]

resample, layer, bounce down, notch filter.

[Dahneboy]

also before you bounce it down time stretch it a little bit to the point where the basses are over lapping themself , then continue on and expirement, have fun