Here is one for the Psychocandy fans. Just put this after your superfuzz clone (or to be more accurate, your "6TR" superfuzz clone) and go to town. The stock transformer part number is unknown but a 42TM013 will do with its 500mH inductance. Both 50k and 100k wah pots were used and input cap were iether 50nF or 10uF.
Schematic avaiable at Tonehome.