I want to do this so I can have sounds from safari (youtube etc), waveburner, logic, quick time player and vlc/dvd player being broadcast through Airtunes. I presume that the easiest way to do this is to set the Airport Express as the main audio out under sound in system preferences, but as I have not yet bought one, has anyone else had experience of this? Also, I use a power amp to drive my speakers, relying on the main volume control on my macbook pro. Is it possible to use this to control the volume through airport? I'm asking because when I use a motu 8 channel firewire audio interface when recording, the master volume on the macbook pro has no effect. Thanks for your help. EDIT: Just seen that the airport express has a delay, so its no good for me. As another solution, is it possible to plug a usb hub into it, in order to connect a printer and usb audio interface, and then use this as the main audio out?