To setup a group in Multiroom paneldo before:
We suggest to cable via ethernet the ethernet cable connection, at least from the Master group device to the router (if it’s not possible use the 5GHz network as preference)
To do next:
Click on the MULTIROOM icon on the top right corner of the User Interface
Click on GROUP DEVICES
Click on ADD to add the selected device to the group
...
Your music is not perfectly synchronized?
Go to the Multiroom client User interface
Go to SOURCES→MULTIROOM→SETTINGS
increase the hardware latency in msec unit, of the relate this will delay all the other devices, in the same multiroom group, among the selected client device
adjust the buffer size in msec unit (in case your hardware/network connection is not performant). This will delay all the network client devices