Switching pedals
Many traditional guitar amplifiers have built-in effects such as reverb and tremolo or vibrato, and a switching pedal, wired to the back of the amp, which turns the effects on or off. Many post-1980s amplifiers also have a distortion channel, which adds tube or transistor overdrive. Players switch between clean and distorted channels of an amplifier with a switching pedal. These pedals do not contain any effects circuitry themselves, and are also called foot switches or stomp switches.
Some 2000s-era bass amplifiers also have onboard effects, such as a suboctave generator and overdrive/distortion. On some bass amplifiers, there is an equalizer which can be switched on and off with the switching pedal. As with electric guitar amplifiers, these bass amplifiers often come switching pedals to allow the player to turn the effects on and off at their will.
