Heres something I've had in the collection for a bit.
An SVF Auto wah based around the stomplfo chip.
enjoy
(https://i.postimg.cc/2LWNXVTF/Trikbox-Flo-Rida-Anti-Wah-3.png) (https://postimg.cc/2LWNXVTF)
Very tidy.
I particularly enjoyed the use of the 5V supply as the bias voltage for the op-amps. That's a lovely little trick to save a few bits.
T.