Assume for purposes of this discussion that I have some Linux machines in different rooms, with each machine connected to speakers. I have a bunch of music, movies, etc. stored on a file server on my LAN. I want to be able to hit "play" on one of the machines, and have the NAS start streaming to all the Linux machines synchronously. (IE, if I go from room to room, the same music will be playing in each room, in sync with all the other rooms.) The NAS has a DLNA/UPnP server and an iTunes/DAAP server built in. How I do?