So here's how it is set up at home: my parents have an AirPort Extreme Base Station by our upstairs computers, which is connected to a modem and we use that to get our wi-fi throughout the house. I want to buy an AirPort Express to use to stream music in my room. But I also have a Time Capsule, which I need so I can back up my Macbook. I know that an AirPort Express can be used to extend an existing network. So would it be possible to plug in the Express in my room, use it to extend our upstairs network, and then hard-wire the Time Capsule to the Express through the ethernet port and use that to connect the Time Capsule? On paper that seems like it would work, because the Express would be receiving a signal from the base station upstairs, and then sending it to the Time Capsule, giving them both access to the network. But I just want to make sure it would work before I drop $99 on an Express. Any help would be greatly appreciated.