Radial's Relay This allows, for example, a singer to manage his microphone to attack the front-of-house sound system or the stage monitors so that he can discreetly communicate with other members of the group or technical staff. This is of particular importance for artists who use ear monitors. You can also use the Relay treated with reverb and echo to strengthen the vocals. This allows the artist to control effects and deliver a more accomplished performance. The Relay Xo has a balanced XLR input and 2 balanced XLR outputs. The audio signal path is completely passive. There are no transformers or electronic buffers inside that could cause any distortion or coloration. Instead, the Relay Xo employs military-grade relays with gold contacts to perform switching. The Relay RadialJR1-L (locking) or JR1-M (momentary) pedal. A 'link' allows multiple Relay Xos to be used simultaneously.