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Here we have the Erupter from Earthquaker Devices. The Erupter is a one knob Fuzz that is voiced to give you the ultimate classic Fuzz tone. The Bass is fat but not mushy while the top end cuts but is not harsh. Roll your guitar's volume back and the Erupter cleans up nicely while retaining it's nice warm low end. The Bias knob goes from gated, to perfectly tuned at the noon position, to refined and loud when turned clockwise.