So basically the Atmos signal is pretending to be TrueHD and the Bluray player will not know what it is sending as a bitstream.

For M we would need HDMI inside the 861 and a chip that decodes it and create the extra channels
Or a HD622 that does it all outboard and sends the extra channels via MMHR #2 connection.

Than it would be LPCM only for the 861.

I assume it would need faster DSP's to do 12 or more channels.

Sold all M equipment