How do I change the audio output settings on my MacBook Pro?

I have connected an HDMI cable from my laptop to my HDTV and I can't get the audio to come out of my TV speakers.  Do I need a special cable for this or is there a way in settings to get my laptop/TV to choose which speakers to play out of?

Check the model of your MacBook Pro against the list in this Apple tech note. If yours is new enough, you just need an HDMI cable that supports video and audio. If yours is too old, you'll need to run a separate audio cable to your TV.
http://support.apple.com/kb/HT4241

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