This is Friedman's overdrive pedal, "Dirty Shirley." Product Description (Quoted from the website of the import agent, Musette Japan Co.,Ltd.): The DIRTY SHIRLEY is a pedal that recreates a flexible, highly responsive single-channel amp, allowing you to achieve the overdrive sound and nuances of a head amp. With intuitive controls, guitarists can get the sound they want. If the low end of the amp or other overdrive pedals you connect is loose, use the Tight switch mounted on the side to control the low end. The DIRTY SHIRLEY is the perfect pedal for British rock. SPECIFICATIONS - British rock at its best - Control Knobs: Volume, Gain, Tight, Treble, Bass, Presence - True bypass - 9-18VDC operation (power adapter only) I am the second owner. According to the previous owner, it was almost unused when I purchased it. I have only checked the sound for operational confirmation. I am selling it because it wasn't to my liking. It has not been used for rehearsals, live performances, etc. I think it's a great deal.