 User-accessible rotary potentiometers can be fitted with a switch which operates usually at the anti-clockwise extreme of rotation.Before digital electronics became the norm such a component was used to allow radio and television receivers and other equipment to be switched on at minimum volume with an audible click, then the volume increased, by turning a knob.Multiple resistance elements can be ganged together with their sliding contacts on the same shaft, for example, in stereo audio amplifiers for volume control.