I can understand hearing a difference in Roon between Sound Profile Default and Sound Profile Alternative *if* this a a global setting that affects Extreme OS settings and allocations beyond the XDMS back-end program. That the Sound Profile settings are in a part of the Settings menu in XDMS called "Extreme Server/Player settings" would imply that these setting affect the Extreme and not just the XDMS music playing software.
However, Discovery and Concert are XDMS playback modes. If you use the XDMS toggle to select between XDMS and Roon, XDMS should be off (XDMS program not active on the Extreme) when Roon is selected and vice versa. Unless Discovery and Concert are somehow affecting the way the Extreme handles Roon loading a track or tracks during playback I'm not sure how an XDMS-specific setting could/would affect Roon.
Am I missing something, Kris?
I never suspect , I always TEST .
Being scientist affects all my activities including music.
So if there is no hard evidence of positive result I stay quiet.
All you need to do it try it yourself.
My system might be very different from yours so it might not have effect .
I was surprised what it did to overall presentation so wanted others to try and report if this is something important or not.
As a sidenote.
ALL settings in Roon affect SQ when playing XDMS , so WHY to think it is not working other way around ?