The ART CoolSWITCH provides full A/B-Y switching functionality, plus parallel Common in/out jacks. A/B-Y switching works two ways. It lets you switch a common source signal (guitar, bass or keyboard) between two amplifiers or amp channels. It also lets you switch two source signals (like two different guitars) into the same amplifier. This high quality A/B-Y switcher also provides LED indicators to show whether A, B or Y routing is in effect. The Y routing combines both the A and B outputs in parallel so that two amplifiers can be driven at once. ARTcessoriesTM Creative audio solutions in cool little boxes. The ARTcessories line includes direct boxes, headphone amplifiers, small mixers, mic cable combiner/splitters and much more. This line is designed to deliver solutions for a number of audio needs - like having phantom power, having one or two more mixing channels, testing cables, headphone processing, preamplification for microphones & turntables, and many more real-world applications.