Seems like a lot of important information is missing from your post. I’m unable to see what you’re after. Maybe you are able to help yourself reading the relevant documentation?
Overview Roon supports multichannel files, signal processing, and playback, of up to eight channels per device. The following file formats are supported: FLAC WAV DSF DFF AIFF ALAC AAC Multichannel output can...
You can also use Roon’s DSP engine to create your own mix matrix .
Other maybe relevant information:
I want to say that, with the new v1.7 version, there are still issues with mapping 5.0 channel recordings to a 5.1 or 7.1 channel output if a Procedural EQ and/or a Parametric EQ is introduced into the signal path.
Is there a solution under consideration?