There are a couple other ways to deal with the low volume/quiet atc sounds:
-In the game settings, try the simulate headphones settings but not my choice as it quiets the external sounds to much for me.
-The other thing to try is turn down the induvial sound settings, especially the engine slider. External view still has good engine sounds this way, while cockpit view you can hear the markers, atc and even dial clicks nicely.
What would be nice is to be able to select as different sound source for atc, as FSX has a setting for. There I set ATC to my monitor’s built in speakers, which are not used for anything normally.
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I have 5.1 system and set to 5.1 but I’m fairly sure MSFS is not 5.1 and is stereo only.
EDIT:
I was wrong, there is a way to have atc through a separate sound device and works nicely.
3rd option in msfs sound section.