auto-wah

Auto-wah is a cyclic filter that produces an automatic wah effect¹. Sources describe it as a filter effect associated with funk tones, quacky filter sounds, and envelope filter style pedals²³⁴. It appears in dedicated pedals such as the Mooer Envelope, a compact auto-wah designed for both guitar and bass⁵, and in units whose filters respond to playing attack and touch⁴. Some pedals can modify the effect, turning an ordinary auto-wah into a step filter or an envelope filter into an auto wah⁶⁷.