Thanks for the advice Barry,
I’m too tight on space to incorporate the tone TWEQ (125b enclosure). I put in the 9v battery compartment just for the sake of it, but I generally use DC. So that’s where I was thinking of putting another set of diodes to offer different clipping. But I assume from what you said it would be so subtle a change that it wouldn’t be worth it. By the way, the pedal seems to be working fine, a real early pumpkins wall of sound, but is it normal for such a volume increase when the tone switch is off?