my wife wants to pump itunes output to her stereo. right now we use a standard wireless router but both our macs are using Ethernet. can I plus the express into the stereo and connect to it wirelessly without it being plugged into the cable modem or connected to the wireless router? how do you control the sound if it comes out the speakers on the computer or stereo. she is blind and it needs to be easy to use but also I don't want voiceover being pumped through the stereo.