I have spent some time fiddling around with alsamixer, unmuting everything and then remuting front. The sound then worked OK. I then unmuted front again and sound continued to work OK. Not quite sure what is going on with that but it did seem to result in good sound again.
I have spent some time fiddling around with alsamixer, unmuting everything and then remuting front. The sound then worked OK. I then unmuted front again and sound continued to work OK. Not quite sure what is going on with that but it did seem to result in good sound again.