R?LAY VRX4 Virtual Radio Mixer software lets you virtualize your radio studio, moving all aspects of the radio studio to a single, consolidated PC-based studio application. Instead of building studios with dozens of discrete, single-purpose boxes, R?LAY VRX4 virtualizes radio production with the use of third-party plugin software from respected broadcast vendors. The result is a complete radio studio, with mixing, routing, VoIP phone integration, codec, streaming encoders, audio processing and more all within a single virtual machine. VRX4 is the four-fader version of our 8-fader R?LAY VRX8 software.