Anyone know the audio quality output via usb-2 to PC on Roland BRIDGE CAST X for watching movies?

My plan is to plug my fire stick 4k max 2nd gen into an audio extractor and send the DHCP video to my monitor, and send the audio via hdmi into the roland bridge cast x (since when dhcp is on in the app audio cannot be sent to pc), and then send the audio via the usb-2 port to my pc (hoping it retains the multichannel information) so i can run the audio through the pc's dolby atmos for headphones and plug my beyerdynamic mmx 330 pro headphones into the 3.5mm jack on my pc.

Thoughts?