I'm having a *hell* of a time getting this set up. I have a Time Capsule and an Airport Express. The TC is connected by wire to a cable modem/router. I have cables in my house that allow me to run a CAT6 out of the TC into the wall, down the hall, to where I would like to set up an Airport Express to extend my wireless network range and run a pair of speakers. Ideally this would all be seen as a single wireless network. What network setting do I need on the TC and AEx to get this all working? Can you be reasonably specific. I feel like I've tried everything.