A CV pedal generates the control voltage itself. A passive expression pedal does not generate the control voltage itself it receives it from the connected device, and returns it on a separate conductor along the connecting cable. Expression pedals are typically passive devices that require no power of their own, with the control voltage being generated by the equipment they are connected to.Įxpression pedals and CV pedals are not the same although they are often confused as they perform largely the same function but in a slightly different way. The amount of returned voltage is continually measured by the device allowing it to determine the position of the pedal and hence vary the effect. As the pedal is moved up and down, the resistance within the potentiometer changes allowing more or less of the input control voltage to be returned. The device sends out a control voltage on one conductor of the cable which passes through the potentiometer and then is received back by the device on another conductor. There is just the single output that connects to the dedicated expression pedal input on the effect device. Unlike an in line volume pedal, there is no ‘input’ on an expression pedal as it does not connect to the instruments signal chain. The potentiometer is connected to an output jack or output cable that attaches to the expression pedal input of the device you are controlling. Inside the pedal the rocker attaches to a potentiometer that moves proportionally to the pedal. Examples include:Įxpression Pedals comprise a pedal assembly that sits on the floor or can be mounted to a pedal board, with a rocker that can be moved up and down with the foot. Increasingly, stomp box manufacturers are also adding expression pedal control to many of their products. It’s important to remember that expression pedals can only be used with devices that have a dedicated expression pedal input and/or have a MIDI control input.Įxamples of digital amps and multi-effects units with expression pedal control include:
But often many more functions such as reverb trails, delay feedback, rotary speaker speed, mix, and so forth can also be controlled, giving the musician significant benefit in a live situation. Most digital amplifiers and multi-effects units support expression pedal control of basic functions such as volume, wah, and whammy which are traditionally controlled from this type of pedal. Exactly what an expression pedal can control, will depend on the features of the device it is connected to. It might help to think of an expression pedal as a remote knob that can be controlled with your foot. The pedals do not contribute to the sound themselves, but remotely control aspects of the device they are connected to. Expression pedals are used to control variable parameters on electronic music equipment such as digital amplifiers, rack effects, stomp boxes, MIDI controllers, and keyboards.
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