Hi Ben
I didn’t have to reboot Roon, but then again I didn’t have it running on the iMac (although the Roon core on the Grimm MU1 has been running since 2pm)
As soon as I fired up Roon I could hear the increase in volume from running BBC Radio 3 via Kef app (and wireless) to when I switched to Radio 3 via Roon.
Bliss
At last!
It is now running correctly (forgot to switch output)!
Now all I need to do is to get the Kef KC62 sub to start working immediately regardless of the input volume and/or bass content of the music which until now has had to be either loud or heavy (or both) but yes, I know that’s another topic thread?