The PWM is great and I can't stop playing with it's weird tones...but I have two issues with it:
1) The LFO omits a clicking sound that's in sync with the LFO cycle when I stop playing.  It's inaudible with a clean amp, but it's very loud into a overdriven amp.  Is there any way to reduce this?
2) The LFO doesn't go slow enough!  Is there a way to slow it down some more?

Danke!

Quote1) The LFO omits a clicking sound that's in sync with the LFO cycle when I stop playing. It's inaudible with a clean amp, but it's very loud into a overdriven amp. Is there any way to reduce this?

You can try decoupling the power supply with a big cap. Perhaps something like a 470uF cap.

Quote2) The LFO doesn't go slow enough! Is there a way to slow it down some more?

The RC network could be changed. Doubling the size of the cap would probably do it.

Thanks Tim!  You give great uh, customer support  

So you mean increase the 22uF to 470uF, and the 100uF to 220uF or so?

sorry: which circuit would that be?

http://www.geocities.com/tpe123/folkurban/fuzz/snippets.html

scroll down about 1/3 of the way.  It makes some great microsynth type tones through an overdriven amp.  The LFO add-on turns it into a cool robo-flanger thing.  This thing is hard to explain!