An effects unit or effects pedal is an electronic device that alters the sound of a musical instrument. These devices produce aural effects that include distortion, pitch modulation, reverb, and delay. More importantly, these devices help our favorite musicians to expand their creativity and produce their signature sound. Besides sounding cool, these devices often look like something out of a vintage Sci-Fi movie. Designed by musicians, for musicians, these devices are every bit as cool as the guitars and keyboards they plug into.