BOSS AW-3 Dynamic Wah Pedal Gives guitarists a wide range of classic auto-wah and dynamic wah effects, plus a new Humanizer effect which can simulate human vowel sounds. A Bass input even provides a variety of funky wah sounds for bass guitar. Compact pedal creates a variety of classic wah effects. Dynamic wah sounds provide variable effect based on picking strength. Humanizer effect creates human voice-type vowel sounds. Dedicated Bass input for processing bass guitar. EXP Pedal mode allows wah control via optional (not included) expression pedal. Tempo can be set for pedal control or at fixed rate via Manual mode. BOSS limited 5-year warranty.