Tech 21 California preamp - BRUTAL Boogie METAL distortion?!

Boosted with Boss SD1. By itself it sounds quite fuzzy and loose, which some can find fine for doom kinda stuff. Guitar: Gibson Les Paul Studio ‘95, hot PAF bridge humbucker The pedal can be plugged either in input or in fx return of an amp. I like how it sounds in the fx return acting like a preamp. Amps: Marshall Studio Vintage 20 Mesa Boogie 50 Caliber plus Cab: Marshall 1960, 2x Marshall vintage 30 (bottom), 2x Celestion G12H30 anniversary (top)