The next release includes individual assignments of sound elements, pre-compiled speech .wav files that can be attached to any element in the skin editor. You can create some interesting interfaces with different sounds from many different sound schemes.
Change sound themes on the fly in xLobbys setup menu. Some Screenshots below.
xLobby Skin Editor
Xlobby Setup Menu
xLobby Sound Folder with sound theme Folders
xLobby Hal theme files
Wes Black \ Calrad