Xotic Wah is modeled based on the Holy Grail wah, 1967-1968 Italian-built Clyde McCoy Wahs. With the Xotic Wah you don't get one or three sounds in one pedal, you get unlimited sounds with unique controls that shape and contour your sound the way you hear it! The adjustability and flexibility of the Xotic Wah makes this one of the most versatile wah pedals available today! Changing the bias warmer will lead the Xotic Wah to having slightly more output & firm up bass frequencies along with a more pronounced wah through the sweep. A cold bias is common with vintage wah pedals for a very clear voice that is more transparent in tone and smoother in operation. A two-band EQ with +/-15 dB center-detent potentiometers optimize the voicing for different playing styles and gear. Located on the backside bottom of the treadle the rubber bumper can be shimmed to adjust the travel range of the pedal. Wah features Fully-adjustable rocker pedal torsion by adjusting Hex nut on the treadle.