Wouldn’t bug you for something we can get from a user manual 
@Stephen_Andruski was asking about cheap, Roon compatible multichannel options that’d work in his setup, so over HDMI I guess.
From what I read in the Ropieee subforum, HDMI out was just recently added to Raspberries, @spockfish said it’s on his todo list, but that’s about as much as I know.
Is there anything you’d suggest ?