Hello dear roon community.
I have made available some key mapping for controlling volume on MacOS using Karabiner-Elements. This makes the media keys for volume controls (f11 and f12) and toggle mute(f10) work when Roon is in focus.
To get this work you first have to install Karabiner-Elements, and then import the complex modifications configuration for Roon media keys from https://pqrs.org/osx/karabiner/complex_modifications/?q=roon
Best wishes,
Tor