I'm stumped. I am using MC13 on my laptop as a music source for my stereo system. I have my library on an external hard drive and I'm using a USB digital to audio converter run into the back of my amplifier. I have told windows to use the USB DAC as the output device and under Control Panel and sound settings, windows says that is what it's doing. When I play something in Media Center the sound, rather than going to the stereo system, comes from the speakers on my laptop. Further, the volume is uncontrollable via either Media Center or Windows. I am using ASIO as my output though I've tried others just to see if that would cause a change. Nope. I should add that if I bring up Windows Media Player and play a selection, it goes right out to the stereo speakers, indicating, I think, that the problem is in Media Center rather than Windows. Does anybody have an idea as to what might be going on? Thanks very much.