Premium players can be syncronised as long as they're all playing the same playlist and are on the same local network:

1. Add this custom setting to the primary player:
   1. Name: syncmode
      Type: string
      Value: master
   
   
2. Add this custom setting to the secondary player(s):
   1. Name: syncmode
      Type: string
      Value: slave

Specify different multicast IP and port to add multiple sync groups to the same local network:

1. Add these custom settings to each player in a sync group:
   1. Name: Network.Multicast.IP
      Type: string
      Value: 224.1.1.124 - Increase the last number for each sync group (224.1.1.124 -> 224.1.1.125)
   2. Name: Network.Multicast.Port
      Type: int
      Value: 4000