I don’t know but I found this…

famous for his massive wall-of-sound, largely driven by the Electro-Harmonix Big Muff Pi pedal, specifically vintage “Ram’s Head” models. He often uses it for both rhythm and lead, valuing its clarity, while stacking it with various fuzz and overdrive pedals for complex, high-gain tones.

I stood infront of his of amp stack at Golden Plains 2010. Was so sweet.