First, I do apologize for dredging up yet another thread about this topic. I promise I have searched and searched and done quite a great deal before reaching out.

As it stands now I cannot hear any TrueHD or DTS-HD MA audio from any source. I can hear the Sonos which is connected to one of the optical toslink inputs. I can also hear the GUI navigation sounds from the Kodi and AppleTV v2 plus the movie audio IF I switch the source configuration to use the 5.1 DD soundtrack. All HDMI sources are configured as PCM although the AppleTV seems to be a "smart" device that won't allow that setting to be done manually and I don't think the V2 supports TrueHD or DTS-HD MA.

The HD621 is a new addition. Prior to adding it I have had the whole system working well using the same equipment plus a 562v which I have now removed as it's redundant.

I have
568.2mm w/ VGA to component adapter cable
DSP5000 x7
HD621
Samsung Blu-ray, Old-model (configured for PCM output)
Kodi PC (configured for pass-through 7.1 and playing 7.1 TrueHD content)
AppleTV Version 2 (I don't think this supports HD audio formats)
Sonos (Optical input; works great)
Xbox 360 (Untested)

I have:
1. Fetched my original 568.2mm config file
2. Re-typed the 568.2mm via front panel to 7.1DDD
3. Updated the inputs to use Audio Input = Multichannel
4. Confirmed the preset for Discrete is set to Discrete
5. I have no sources in use marked as "This is the enhanced source"
6. The comms types are set appropriately (none)
7. No tick boxes are ticked in the advanced tab (DTS delay, disable smart data, poor digital audio source, or source uses validity flag properly)
8. Discrete preset is modified so that 2+2+2 = 7.1
9. Speakers are all Large 96.24 DSP (unchanged)
10. Confirmed that in MONO mode I can hear Sonos from all speakers
11. Stored with the 2.5 and higher firmware choice selected (box is showing "2.5b9m/V262m" on the front display)
12. Re-typed the HD621 using Mconfig to Type 0 (Multi-channel High Resolution LPCM, Dolby Digital and DTS)
13. Created a scratch configuration for the HD621 with H1-H4 defined connected to generic blu-ray sources, and a non-existent G65 processor
14. HD621 audio properties are: Audio Output: SmartLink/MMHR; MHR Connection: SmartLink; Linear PCM 8Ch. (also tried 6Ch. with no luck either); Dolby Digital 5.1Ch: Yes; AAC: No; DTS: Yes; Output Rate 2x (96k): Yes; MHR: Yes.

I welcome any help you can provide. Again, I can only hear DD 5.1 soundtracks, no True HD or DTS-HD Master Audio soundtracks from any source.

568.2mm, HD621, 7x DSP5000, Samsung BDP, Kodi PC, ATV, Sonos, Xbox 360