When I tried this, I was unable to get it to work. I could select JRiver as an output option for Roon, but when I started a song, both JRiver and Roon would indicate that the song was playing, but wouldn’t move past 0:00. Both Roon & JRiver function separately with no issues.
I’m at work now, but I’m looking forward to giving it another try. Does anyone have any idea what might have caused that behavior?