Killswitch
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An electronic musical instrument, such as a guitar or bass guitar, may have a kill switch. Used infrequently, but most commonly in heavy metal music, they break the circuit causing there to be no sound output. This is normally achieved by turning down the volume of one of the pick-ups then alternating the pick-up selector switch between that pick-up and one with the volume turned all the way up. They are sometimes used when a singer doubles as a guitar player and isn't playing or sometimes used as an effect during a song.