Yes, that’s the window I have been using to adjust the speaker settings . It matches your picture almost exactly, except that mine does not say “2-channel”. If I press “Restore defaults” it resets it to “24 bit studio quality”, which is how I had it previously. The quoted name of the speaker driver is “Conexant SmartAudio HD”, and it simply sends the output to the computer’s jack socket at the side (it’s a laptop.)
I may try your “extreme” suggestion, if I can pluck up the courage!! I assume that if the worst came to the worst, I could just reinstall Dorico?
Philip