I have Music-2-channel configured in MConfig as Trifield for the default. This works when I use the optical output from my Mac to play 2 channel CD's.

However, when I output LPCM from my Oppo into the HD621 and then to my 861 I only get direct, ambisonic, THX, etc. as choices and not Trifield or Stereo as choices when I play the same CD.

What am I missing here? What settings do I need to change to enable Trifield?