No sound when using MDP to HDMI adaptor.
I've just purchased a Mini Display Port to HDMI Adaptor, The picture is great, quality is super, however I can only here sound through my Macbook pro. I know my MBP supports sound through HDMI, I've checked System Information and under Audio built in, there is HDMI Display port output. I don't know how to tell MBP to play sound through HDMI.
MacBook Pro, Mac OS X (10.7.4), Magic Mouse, and airport express