The BOSS AW-3 wah pedal uses a digital processor instead of analog circuitry: In addition to optimal sound quality, this enables a variety of classic and modern wah-wah sounds, such as touch wah, auto-wah and "humanizer". An expression pedal can be connected for the classic pedal wah sound, and a special bass input is available for the bass players, for example to play the popular BOSS touch wah sound.