Hello, I got a Mac Air and bought an Airport Express. I have configured the Airport Express so it is a client on my existing house wireless network. The green LED on the Airport Express is on, and I have tried to turn the house wireless router on and off, and saw that the green LED went from green to flashing yello, and back to green, when the house wireless router was back on, so I count on that the Airport Express is regornized as a client, on my wireless network. My Mac Air is also on the wireless, and fully connected to the internet. The problem is that ITunes seems not to "see" airport express, the music only comes out of the Mac Air's own speaker, and not on the speaker system connected to the airport express. What can be wrong, how do I create connection between Itunes and the airport express?