Hi,
Before I open a ticket with Crestron, I want to see if I am missing something.
I have discovered that NONE of the -DSP cards, HD, 4K, 4KZ will down mix any LPCM multichannel with 24bit stream. 16 bit works fine***, but as soon as the format is changed to 24bit LPCM, only Left/Right channels ever come out of the analog outs. And DM tool will actually erroneously report that source is 2 channel (reports 6 ch if 16bit stream). Same signal can be routed to HDMI destination (AVR), and DM reports the audio is 6 channel on the output side.

Firmware, settings, restore - spent entire weekend messing with this and the 3 generation of DSP cards. Not seeing anything in the spec sheet that mentions this limitation.  Any tips appreciated.
***Additional issue I discovered, with 5.1 LPCM at 16bit/44.1khz from Windows PC, the subwoofer channel is missing the the stereo down-mix. I have to do further testing to verify this.