OK....Results are in.
5.1 MLP track saved as a 5.1 .WAV then converted to 5.1 FLAC and MP3Tagged.
Crion has played this via Dune 3.0 into an HD621 via HDMI
Dune screen G68 shows Music and Discrete and it produces 5.1 96/24 music.
G68 display As far as I know this is the only product to do this so far.
i.e. play your DVDA content from a media server in all it's hi-res 5.1 glory.
This means that for those of us that moved away from playing silver discs onto media servers, we can now have the DVDA included in that process.
Good news I'd say.
Crion, many thanks for your help here.