I've just bought an Airport Express to allow me to play Itunes music in another room. I have an existing wireless network based in a BT Voyager 1040 router. I only ever see the Airport as a separate network and assistant does not see it unless I connect to that network. The yellow led flashes once per second when I am not connected to the apple network. There is obviously something fundamental that I am missing here. I have searched the forums but cant find anything. Can anyone help me? Thanks.