Macbook Doom3 UB No Sound

can you help?
i have doom 3, just bought from my apple store and i have the latest patch including the UB update. i have sound on everything within my macbook, itunes web etc.
but every time i launch the the game there is no sound, not with the built in or headphones connected.
am i missing something? does the macbook or OSX have a "sound within games switch?"
Confused
Steve

This YouTube video shows that, while a bit jerky, yes, you can get Doom 3 working with audio on a MacBook.
http://www.youtube.com/watch?v=TC5ST9VHcnk
Games do generally what they're told in terms of sound. Does your Mac play sound at the Finder? Have you set the sound at maximum from Mac OS X and then launched Doom? The game itself, of course, has its own sound settings. I'm familiar with the game's layout, but these are the places to start.

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