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I've built a Tonemender using the PCB layout suggested in their site and it works perfectly.
I still have one thing that I'm not satisfied with, that is a big POP when I flip the mid-shift switch that's bypassing two caps in the tonestack.
[electronics illiterate mode ON] Would a shunt resistor (one per cap) work to prevent this? How big should it be? [electronics illiterate mode OFF]
Thanks,
Max.

ps: I would also like to reduce the output, I always keep the level pretty low and if I increase it it brings out a lot of hiss. Shall a bigger pot do the job? there's already a 500K A.

EDIT: Looking more carefully at the circuit probably the shunt resistor is a stupid idea. But then I don't understand the POP. I think I'll go and check the PCB...

Hi All, I'm Max and I come from Italy. I play guitar a little bit but I'm actually a drummer (and an aerospace engineer, but that's an accident  ) and I play with electronics since I was 12. I've built small things for my former guitarist, cloning some pedals when I could put my hands on them and experimenting a little bit.
Now I'm finally finishing a very old project putting together some effects for myself, which work all pretty well except for one where an IC started to smoke during test. Which is not bad, last time I destroyed an IC it literally exploded  . But that was used as a spark generator for gas heaters...