Thanks Richard

The instructions talk about the ability to send video and audio on the HDMI out feed.

Quote
"HDMI Output: Video – This outputs the video information present on the selected HDMI input.
By default, it does not carry the audio information, but can be configured to do so."
And in the set up section.
Quote
"The first row, Audio Output, selects the output port used to interface with the system, using the pop-up menu in the “Value” column. This will either be “SmartLink/MMHR” (normally, to use the phono or RJ45 outputs) or, exceptionally, “Video HDMI”, which retains the audio on the the HDMI output along with the video"
So, it looks like you can set it up to send video and audio to the display via the HDMI out. The way it's worded and the config options are chosen, I've assumed that this must turn off the audio feed via all of the other connectors.

Home Cinema: Panasonic DMPBDT700, G68, Jeff Rowland MC6, Adept Response AR8, 803 Diamond, HTM3s, ASW855x2, CCM816x2, Pioneer 506XDE, Nordost / Au24 cables
Stereo: 808i.2, Audio Research Ref 3, Canary Audio 303s monos (modified), Adept Response AR8, Living Voice OBX-RW, Valhalla cabling