I do this at home and the only gotcha is that if you have No Source Selected in the video portion and you have your DVI source selected as audio, you will not hear any audio. You have to have a source selected in the video portion to hear audio.
What I do is make sure video goes to the "audio" source when no video is selected.
In other words, if the first source selected is one of your audio sources, it will tell the dm to show the dvi card as the video.
