After completing the routing configuration, go to "Customize Actions & Events".
Then, Select the room and Media Zone Events.
Select “Media Zone On” on the left column. Choose “Sequence” and “Media Operations” in the middle column. Add a 1-second delay and a “Set Volume” from the Media Operation selection to the sequence. Enter the turn on room volume level (In %) in the dialog box that will appear when adding the Set Volume option.
After setting the start-up volume on CH, go to the Sonance configuration page and set the startup volume to the lowest level possible, in this example, -70. The intent is to have CH be the single point of control and to avoid any jumps in volume level when the room is turned on.