Volume control on Genie Remote (RC73) - DirecTV

How do you decrease the volume using the Genie Remote? Our old remote had a VOL rocker switch with + and + labels, but the RC73 remote only has a single VOL switch. If I press it, the volume increases, but I'm not sure how to decrease it. I guess the same question applies to the CH key. Note that I already programmed the remote with the TV model, and all of the other keys on the remote work fine. I guess this is just a user interface question, but I can't find any relevant docs on the DIRECTV support site.

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