For mixing audio from microphones or other sources, a separate audio input is included. When connected to a network, control is possible via LAN either using Telnet, or using the internal WebGUI. The flexible WebGUI lets users create, name and assign functions to virtual buttons.
A keypad port is also included for connecting an X21-UI remote control wall plate when physical control of the room with a real keypad is required.
Other advanced features include priority page mute, ducking, auto input priority, L/R to mono mixer, and ARC audio support.