ilovefuzz.com

http://www.electrhysity.com/shop/

They'll make you one or you can send in your wah and they'll make it one. The wah sweeps the frequency.
[youtube]http://www.youtube.com/watch?v=2JPDVnZGCZc[/youtube]

Yesssss I have a new purpose for my old crybaby now

Exactly. Somehow I accumulated three of them and only need one.

I turned my crybaby into a volume pedal