I have done some more investigating and the below, which I sent to Outlaw tech support this evening, is what I am seeing (hearing!?) now.

I'm sure this is just a setting, however I have been unable to figure it out. I have an Oppo Blu-Ray player connected via HDMI to my Model 976. I have a test disk that has PCM, Dolby TrueHD, and DTS Master Audio sample material. The Oppo has a setting for "HDMI Output Format" with the options of Auto (factory default), Bitstream, LPCM, and Off. According to the Oppo manual, if the setting is in 'Auto', then it should detect what types of formats the 976 can receive and send them in that format. The problem is that although when I play the PCM sample material, everything works but if I play the DTS or Dolby samples, the 976 does not play any audio and the display seems to indicate that it is not receiving any (none of the speaker indicators are lit). If I switch the Oppo to force the output to LPCM on HDMI, then the 976 will play all of the sample material but will only display Multi-PCM. I never see an indication that it is receiving DTS or Dolby material.