I have an extra wireless router, the original airport express, and I'd like to use it by putting it in another room and connecting speakers to it. I did this before, with the airport express connected to the network over its ethernet port, and that worked great. How do you do it wirelessly? It's basically putting it on the network in reverse - instead of clients connecting to it over wireless, it's a client connecting to the network wirelessly. How do you do that?