Hey Flick you were right. I tried a boost pedal with level at zero after the Muffs and before the MM; The difference in Muff sounds with MM clicked on and off is dramatically less. Thank you!

Thanks for the suggestions, gvelasco.
My chain is buffered at the very beginning of the pedals and I tried taking it out of the chain, with no difference. Maybe putting it right next to the MM will help?
This isn’t the first issue I’ve had with this pedal. I love it, but it’s interacting with the Big Muffs in a way that is very perplexing!
It’s almost as though when you click it on, it’s adding voltage to the Muffs????

Addendum :
Actually I’m noticing that the MM being on also affects the tone of the green Sovtek Muff as well. I adds a bit of treble. I hadn’t noticed it before. The volume is unaffected though, unlike with the Tone Wicker Muff.

Sorry I don’t have that adapter to try.

I’ve tried the Voodoo Labs on your recommended settings, a Signal-Flex, and at least 3 other generic 9v adapters.. unfortunately the pedal is still malfunctioning with all.

Thanks- I already have actually. I set up a repair, but I thought I would post here to see if anyone knows a quick fix because I don’t think this will be covered by warranty, and I am pretty good with DIY fixes.

The way it’s behaving though… seems like maybe a bad chip. I’m guessing.
Thanks for your attention!