[wa-wa pedal] n [imit.] (1968): an electronic device that is connected to an amplifier and operated by a foot pedal and that is used (as with an electric guitar) to produce a fluctuating muted effect
WA-WA PEDAL
Meaning of WA-WA PEDAL in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012