I gotta have an amp with crunch. If so, I have recently, 2 yrs, started using an eq pedal by Orange called "two stroke". It sounds ornier than the 1979 yz 125 with 250 jugs my dad rode when I was a kid. Handlebars wide as a semi......or the Moore 150 amp modulator which, someone mentioned, is probably cheating. Joyo also has an extreme metal pedal that I purchased and grudgingly admit could easily replace the Mooer and the EVH 5150 overdrive pedal I rarely plug up.