WAH-WAH PEDAL 'Analog Wah effect and volume in a single expression pedal. You can use the Wah effect in 2 modes: SENSOR- You activate and deactivate it with your foot, a circuit will do the rest, SWITCH- The traditional way to control the Wah with your foot. With the Q Range control you can adjust the effect to your liking. In volume mode it will behave like any other volume pedal and you can adjust the minimum with the volume control. Wah/Volume mode. In this mode the Free Step will act as a volume pedal and you can activate the Wah effect. It has an LED that indicates the operation in progress.'