The Purple Nurple is capable of quite a few things. At low volumes it can be used as a mild fuzz pedal. With an amp on the verge on breaking up, it can be used as a clean boost or use the GAIN knob to dial in more grit. Have an amp that has a great low gain sound? Use the Purple Nurple to add even more gain. Think of the Purple Nurple as an enhancement to a tube amp that is on the verge of or breaking up on its own.