One knob. One giant wall of Fuzz. This is the thickest of the bunch with lots of vintage voicing and deep textures. Its pretty much all or nothin', turning down the level will make it quieter but the gain is still there. Rolling off your guitar volume, however, will clean up your tone while maintaining sustain and fullness. It sounds almost like a Maestro Superfuzz without the EQ dips. Tons of output and at the top end of the dial some cool high end sizzle comes into the mix. This guy is the boss for a reason.