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Cox Cable remote doesn't control volume?

I have a new TV and hooked it to my Cox Cable HD box via HDMI cable, and programed the remote to my TV type. The remote controls power and channel changing but it has little effect on volume. Do I need RCA cables as well from the cable box to TV? How can I get the remote to control volume as well??? Thanks for any help. 

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Figured it out on my own. Thanks.