Effect pedal

An effect pedal is an electronic device that can change the sound of an instrument or the voice of a person. Typical effects include echo, chorus, distortion, tremolo, reverb and flanger. A potentiometer is one of the electronic parts that effect pedals use to change the sound.
Effect pedals are commonly connected to electric guitars and bass guitars and to amplifiers using a cable, such as a phone connector. The pedal is then put on the floor and controlled using the player's foot. Depending on how the effect works, there are different ways to use the pedal:
Many guitarists like to use different effect pedals with each other. They stick them to a flat surface to make a pedalboard that they can take with them.