Cool Switch
A/B-Y Switch
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. Or conversely, it lets you switch two source
signals (ie, two different guitars) into the same amplifier. A good
quality A/B-Y switcher will also provide LEDs or other 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. The CoolSWITCH provides full A/B-Y switching
​ functionality, plus parallel Common in/out jacks.