Help with Mark Hammer's Woody pedal please!

[smoguzbenjamin]

Hi guys (and especially Mark Hammer )

I breadboarded the woody, it's fine except that when I turn the 10 k "top" pot over 50% the signal dies and when I dig into the guitar it gives me the well-known misbiased transistor sound What did I do wrong? Can anyone help me? I used a TL072 for the splitter/mixer, a TL071 for the bottom boost section, and a TL072 and TL071 for the treble boost. I checked my wiring on the breadboard and I think it has something to do with the input impedance of the opamp and the fact that the resistance to the treble signal declines as I turn the pot up... Or am I completely wrong?

Help is very much appreciated!
Cheers
Ben

[smoguzbenjamin]

Bump

I added another 12k resistor after the treble pot, sortof shifted the problem, now I have to turn it past 90% for the misbiased distortion sound... I think I'l redo the treble emphasis part...