Besides switching the default audio device, how can I send the audio from one app (say x-box music) to one audio device, and another (say the video app) to another audio device?
Edit:
Looking further, I found this: http://channel9.msdn.com/Events/BUILD/BUILD2011/APP-408T At 16:16, he demonstrates exactly what I'm wanting to do, but when I go to the devices charm, I get a message: "You don't have any devices that can receive content from Music".