(Clarification: when pavucontrol causes everything to mute, above, it's not actually muting the alsa channels: it just causes no sound to come out, and no amount of playing with the volume gets it back.)
(Clarification: when pavucontrol causes everything to mute, above, it's not actually muting the alsa channels: it just causes no sound to come out, and no amount of playing with the volume gets it back.)