MOOER Micro ABY MKII - Aby Box AB/Y CHANNEL SELECTOR PEDAL The new version of the Mooer switcher, the Micro ABY is now enhanced with the ability to sum A and B. The Micro ABY switcher can be used in both directions, that is, the signal path can flow from Y to A or B, or from B or A to Y. In A/B mode the signal from Y can be alternated to the A or B output (for example a guitar and two amplifiers). Or, in the opposite direction, the signals from A or B go to Y (for example two instruments in the same amplifier).