No audio with HDMI cable connect - need optical cable?

I have just connected my AppleTV 2 with my Pioneer ELITE 910 HD Plasma TV system.  I have a hard wire ether net connected.  I have a great picture coming out of the HDMI connection from AppleTV plugged into my ELITE 910 HDMI Media Receiver.  But I am not hearing audio.  I have gone through the 'settings' menu on the AppleTV screen and have every setting correct (I believe)   It might appear that I may have to purchase an Optical Digital Audio Cable that would input into my Pioneer ELITE VSX-54TX receiver (that does have an Optical Digital Input that has not been used.)
Am I on the right track?  I was hoping the video AND audio would travel through the HDMI connection.   I don't want to spend money on the cable if I don't need it.

Re: No audio with HDMI cable connect - need optical cable?
Yes, audio and video should go via HDMI.
Do other peripherals work ok with the pioneer over HDMI.
My LG BlueRay player works fine.  My TIVO works fine -- good audio and video
AppleTV is a bit odd with audio at times.
Does the pioneer media box handle doilby digital and linear PCM?
I don't know what "linear PCM" is.  All the specs on this 2004 system are here:
http://plasmatvbuyingguide.com/plasmatv/pioneer-pro910hd.html
If you have Dolby Digital set to Auto I'd expect you to get some audio - if set to On and media box can't decode DD then you may get no sound.
Try cycling those settings as well as the one for audoo bit depth.
Have done all this.  Still no audio

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