just wondering if anyone knows if deadmau5 is using a plug in or something to make this effect because i have never heard it… maybe a delay effect of some sort? would help if someone knew!
this song from 2.30 - 3.30
this from 3.00 - 4.00
take it your also a deadmau5 fanatic 
it could be a combination of or:
LFO rates sped up
tempo change
delay + feedback
i think its probably all threee, gotta remember deadmau5 uses a lot of modular kit too so u can get these unique sounds from using that and some cool effects with them
There was a recent techtip on this No. 68
wow that tutorial really helps phil, sounds really close to that deadmau5 sound… and it answered my question thanks!!