If you want total wierdness you should try the frostwave resonator.
It's an MS-20 filter section in a pedal - inexpensive but capable of extremes.
I believe Aphex Twin uses the MS-20.
Check out my review:
one less than none wrote:
HI im my search for more wierdness and the desire for my guitar to sounds like the aphex twin i am looking at filter units. The one i want is a waldorf x-pole but they no longer make them. I am also looking at the MAM warp nine. i was wondering if anyone had any experiance with these units