Thanks for the feedback.
I suspect it was not very clear what I have setup.
I have CD Audio being output from the Audio only HDMI output on the DBT3313 to the HDP (HDMI2) input on the AVR2310. This works fine, using Pure-Direct mode, for music only listening.
. No surround sound or Audyssey being used.
I have the Blu-Ray/DVD Video and Audio from the Monitor HDMI output on the DBT3313 to the DVD (HDMI1) input . This is not quite working properly.
The DBT3313 has 2 HDMI output settings, Bitstream ( default) and PCM.
When I tried playing the first blu-ray with DTS-HD sound, the "blue" light came on , but no sound at all.
I changed the Audio setting from Bitstream to PCM, and the sound came OK , using the MULTI-CH format.
Not sure why this is happenning. Not sure if it is a compatability issue between the 2 units. I am using the provided Denon HDMI cable between the DBT3313 and the AVR2310, so would expect it to work OK.
Any thoughts appreciated.