Help:  Only 2-channel stereo audio!

I only get Stero audio off my Apple TV.  I have it connected via HDMI to my Pioneer Elite receiver which is HDMI to my Plasma TV set.  I have updated it to the latest software but cannot get the receiver to switch to Dolby for movies or anything. 
My DirecTV receiver connected via HDMI plays DD 5.1 fine.  Same with my Xbox 360. 
I can't seem to get Apple TV to do anything but stereo.  Thoughts?

I have my Apple TV connected to a Pioneer Elite receiver also and then receiver to Sony Bravia TV.  I have the Audio and Video setting on the Apple TV set to Dolby Digital >On.  You might try that.

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