Thanks. I have already checked that and there is only one setting and that is stereo, this is on 'Speakers (Realtek High Definition Audio). The other choice is ‘Realtek Digital Output’ which I don’t use. FS2020 spatial sound is already set to OFF. Again, makes do difference, ATC still faint. I am about to connect some very comfortable BOSE headphones to the rear MB headphone jack, and see what sounds come through there. Just tried the headphone jack and the ATC sound is coming through headphones loud and clear