We do outdoor movies in the summer. I have outdoor speakers set up through my Harmon Kardon receiver. In the past I have always played the movie through a dvd player and run an s video out to my projector and the audio to my receiver. I now want to play a movie from my computer. I have the HDMI connection from computer to projector but can't seem to figure out how to get the audio through my receiver so I can use the outdoor speakers. Any ideas/suggestions? Thanks!