Multizone works, but not the "XLobby" way. Meaning that there hasn't been too much success with syncing with the Xlobby command. That being said, I and others have successfully used Xlobby with PervTalk, mulitple instances of Winamp/Foobar, the KX drivers and Audigy/Live cards. Currently I have a 7 zone system (3 up and running...just have to get time to install the rest of the speakers), and 3 different ways to sync...mainfloor, upstairs or whole house.
I've done it using 10 instances of Winamp. Each zone has a dedicated winamp instance. Another way of doing it is using the above and also using VAC (Virtual Audio Cable), a member here named Scalt has successfully got it running using VAC. Another pioneer (to me) is rhinoman. He has done it mainly with hardware...pretty slick system if I do say so myself.
We have numerous posts on getting it up and running...below are a few:
My skin -
http://www.xlobby.com/forum/viewtopic.php?t=5380
In the zip is a docuement on setting it up.
Rhino's skin in progress -
http://www.xlobby.com/forum/viewtopic.php?t=5497
KX/PervTalk possiblilities -
http://www.xlobby.com/forum/viewtopic.php?t=5441
Basic KX DSP document -
http://www.xlobby.com/forum/viewtopic.php?t=5504
More Basic KX DSP info -
http://www.xlobby.com/forum/viewtopic.php?t=4704
Also click on my signature, or my "WWW" button to view more of how I've done it.
And we are all here to help you out, so don't hesitate to ask.
Hope this helps.
*Added Edit*
OH and most recently I've been able to set up a VFD to display Now Playing info (artist/track/album) for all 10 zones (outside of using Xlobby mind you, but still useful)...have a gander at how it is done here -
http://www.xlobby.com/forum/viewtopic.php?t=5576