[WEB Exclusive Inventory Clearance Sale] Please note that clearance items may include store display models, slightly damaged items, or items with damaged packaging. The DIRTY SHIRLEY is a pedal that replicates the flexible and highly responsive sound of a single-channel amplifier, delivering head-amp-class overdrive sound and nuance. Intuitive controls allow guitarists to achieve their desired sound. If the low end of the amp or other overdrive pedal you're connecting it to is loose, the side-mounted Tight switch allows you to control the low end. The DIRTY SHIRLEY is an ideal pedal for British rock. British rock at its best • Control knobs: Volume, Gain, Tight, Treble, Bass, Presence • True bypass • 9-18VDC power supply (power adapter only) FOOTSWITCH: This is a switch that toggles the pedal on/off (true bypass). VOLUME: Adjusts the volume. GAIN: Adjusts the amount of gain. BASS: Adjusts the low-frequency range. MID (Mid) Adjusts the mid-range frequencies. TREBLE: Adjusts the high-frequency range. PRES. (Presence): Adjusts the ultra-high frequency range. TIGHT SWITCH: Adjusts the bass response. This is the IN (input) terminal. OUT is the output terminal. Power supply: DC 9V-18V power adapter only (center negative) Dimensions: 7.1(W) x 12.1(D) x 5.8(H) cm (including knob height). Weight: 302g Accessories: Warranty card, English manual