The box allows you to select a source and adjust its volume on a previously chosen output. As for its display, it allows you to choose the channel you want to select and then to adjust its volume. The control box is connected to digital channels 9/10, 11/12 of the matrix(*). DZ-CTL has a RD output on the back to connect other DZ-CTL. The DZ-MATRIX Setting Software allows you: To change the name of the box with the DZ-MATRIX setting software To give access to the sources and outputs in order to limit the settings for the end user Password lock and adjustable screen saver (*) Use shielded CAT5e or CAT6 cable with a maximum length of 100m LINK FOR FULL INFORMATION: DZ-CTL