Max2Play Home 2016 (en) › Forums › Max2Play as Squeezebox (Player / Server) › DLNA/UPnP and AirPlay with Squeezelite: Only two zones show › Reply To: DLNA/UPnP and AirPlay with Squeezelite: Only two zones show
If you are using the Squeezebox Server, you can use any Squeezebox app to synchronize different streams. (Squeezebox has a protocol to make all Squeezelite players DLNA compatible, but not synchronizable through this protocol)
If you are using Shairport AirPlay, you can use iTunes to synchronize streams.
You can check the status of your players in the Audioplayer menu of each device/zone in any browser of your choice.