Is there a way I can have the sound played on one soundcard be replicated on another sound card? Thing is am stick of having to keep changing the default output device on the sound card when am watching tv at night when everyone is asleep. Also alot of application don't seem to like you swapping the default playback device. Even you've changed it will be one you switched from. Only way to solve this is to restart the app. Firefox does this. Games I've played also do this. Forgot to mension it's a logitech usb headphones I want to mix to that doesn't have a line in.