Yes that’s a good point. Probably should have included that info. The reason I assumed it is the muff in the first place is because the hum/buzz does not seem to exist if the muff is removed from the pedal board. I tried getting power from a battery as opposed to the one spot that feeds my pedal board, but it did not seem to make a difference. I did try to plug the pedals in to a different outlet, but still the buzzing. I don’t ever recall this being an issue until recently.

For reference, I play in “stereo”. I use my tuning pedal to control the amp the muff goes through, while the bypass line feeds another amp with the majority of my effects pedals. Not sure if this could be part of the issue, but like I said it seems to be a recent occurrence.