- Anne Beetem Acker
Electronic device that changes the sound of an instrument, especially used with electronic or electric instruments such as electric guitar, bass, and keyboard. An effects unit can be a rack-mounted box with manual controls (most commonly used in studios), a tabletop box with manual controls (commonly used by a DJ), a box set on the floor (a ‘stompbox’) and usually operated by the foot, or built into an amplifier (including those in some electric guitars). Multi-effects (multi-FX) devices combine several effects in one unit, allowing combinations to be pre-set and accessed with one touch. The most common stompboxes have one pedal and one effect, but some offer multiple effects and a simple pedalboard for selection. Effects units can be connected into an ‘effect chain’. If an effects unit in the chain is turned off, the signal passes to the next in the chain, allowing the performer to choose which effects in the chain to control. Multiple effect chains can be controlled from an ‘effects management system’....