What are the audio capabilities with the 1st 4 generations of MacBook Pros with standard full size DVI outputs when using a DVI to HDMI adapter? I know that the mini display and thunderbolt ports support full quality 7.1 audio at 24bit 96KHz over HDMI (plug and play right out of the box to a surround receiver). What about the DVI machines? Can you at least get stereo audio thru the DVI port for basic TV/movie watching? Or is audio over HDMI only available starting on the 5th generation MacBook Pros?