by petedan10 » May 23rd, '16, 01:13
I couldn't find a setting under pavucontrol to fit the quirks of my soundcard, so I ended up editing /usr/share/alsa/alsa.conf. I am not sure this was the correct way to do it, but it did the trick and everything works fine now.
I also found that changing settings under /usr/share/pulseaudio/alsa-mixer/profile-sets didn't seem to affect anything, at least given my limited experimentation (though it's usually the place to go in other distributions).