Radial Engineering RELAY XO Balanced Remote AB SwitcherThe Radial Engineering Relay Xo Balanced Remote AB Switcher is a 1 input, 2 outputs balanced audio switcher designed to route the output of a microphone to two different audio inputs. This enables a vocalist to switch his mic between the main PA system and the monitors for discreet communication. This is of particular importance for artists that employ in ear monitors. You can also use the Relay Xo to send the output of a microphone to two channels on