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Expression pedal

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  1. A device consisting of a pivoting foot pedal tied to some circuit which generates a control signal, depending on the position of the pedal. Some are self-powered and generate a control voltage output. Others are intended to be plugged into a dedicated input on a synth; generally the synth supplies power and ground via a TRS jack, and the pedal circuitry is just a potentiomenter tied into the mechanism.
  2. A MIDI continuous controller type. Synths which have dedicated expression-pedal inputs often output controller messages of this type when the foot pedal position is changed.

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