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Yes!! Such a dumb error but it made all the difference :) I am in awe of your sleuthing, Robert - thank you so much!!

Thanks for replying :) I used a 2N3906 as per the build doc and replaced it to be sure (and switched orientation). I'm sure the clipping LEDs are correctly orientated, they glow when I strum. I also built the same board twice with the same results, but maybe made the same mistake twice, ha ha...

So, I had two boards and built the second to see if that was any different. It is the same, very minimal effects from the tone/filter. The schematic of the filter section is 1:1 with the Ibanez WH10 wah - so the tone should have a gnarly sweep. Anyone built this and found the same?

Rear of PCB...

Checked through the joints and parts, cleaned flux, but the filter/tone control is having very little effect on the sound. I can hear it filtering the high frequencies in the background noise but certainly not cocked-wah territory. Any known issues with this, or is it just very subtle? Readings...