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There are certain pedals that can act a like a light switch, and others act a lot like a sewing machine pedal were you have to apply pressure constantly. Usually at rock concerts they tend to use the pedal as a looper (meaning you loop a certain sound you have to play and sound sequence); the pedal acts as a switch to record it when you hold and when you let go it plays for you and just sit back and watch or the pedal can be used to filter sound as the desired effect.

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