I used the "killall pulseaudio; restart alsa; reset Sound Preferences to use ALSA everywhere" method. It nearly worked (the Test button no longer failed with "Can't connect" message). I then installed 'aumix' and turned things up manually. The settings there were very different from Sound Prefs. Cranking those up made sound audible. Hooray! Suppose I'll have to do this on every reboot.
I used the "killall pulseaudio; restart alsa; reset Sound Preferences to use ALSA everywhere" method. It nearly worked (the Test button no longer failed with "Can't connect" message). I then installed 'aumix' and turned things up manually. The settings there were very different from Sound Prefs. Cranking those up made sound audible. Hooray! Suppose I'll have to do this on every reboot.