The INTUPAK VLA42 adds features to installed audio systems that contractors and integrators often miss. It switches between 4 sources, and adjusts the master volume -- not only via its on-board controls, but also via the optional remote wall panel VRE-11 or the included infrared remote control. One of the 4 inputs features ultra-high CMRR circuitry, accepting long cable runs, making the unit ideally suited where a central audio signal needs to be received from far away just as well as local signals need to be processed. Due to the provided IR sensor extension connector and the digital RS485 control port, the unit can be placed in reach of the operator, just as well as hidden in a suspended ceiling or similar. In combination with the optional VRE-11 wall panel, an additional local audio input is available on the panel. Unlike other products for similar purposes, the VLA42 adopts high-headroom digital potentiometer circuitry for unparalleled audio performance.