Page "Effects unit" Paragraph 19

Not all stompboxes and rackmounts are effects.

Strobe tuner pedals indicate whether a guitar string is too sharp or flat.

A footswitch pedal such as the " A / B " pedal route a guitar signal to an amplifier or enable a performer to switch between two guitars.

Guitar amplifiers and electronic keyboards may have switch pedals for turning built-in effects on and off.

Some musicians who use rackmounted effects or laptops employ a MIDI controller pedalboard or armband remote controls to trigger sound samples, switch between different effects or control effect settings.