MOTM

a) make sure the audio input jacks *do not* have a wire from the top lug to 
ground (early instructions had this, later ones did not)

b) try changing R29 to 56K or 62K

> but... in my experience it overdrives *super* easily, and pretty much
> stops behaving like a filter - the resonance control does very little
> and tweaking the filter knob gets kinda flanging effects.