I don't have a schem. I think the mod you refer to is the Mold Spore. It used a vactrol in there. I suppose you could use the Anderton noise gate on the wet signal. Keep in mind, this isn't a trivial addition.
I forgot to ask u 2 more questions. In the uglyface, can i put a bigger pot to push the led harder?. What size of led/ldr do you suggest?. I can't find optos in here. Also...i want to experiment with the gargler. I can't find a pfet, how can i use a nfet, and have similar results...maybe changing that transistor...can't find an answer. Thanks for the replies!!