> In my case. "timidity" was causing my problem. Within X, I did a "sudo kill
> timidity", and immediately my Volume control on the pane of KDE's Plasma
> desktop changed, and the volume control slider produced test clicks. I
> tried purging timidity, but it seems to want to take half of KDE with it,
> so I'm gonna hold off until tomorrow to tinker any more with it.
>
> Whew!
Yessir. The timidity update on 19 June messed up my sound, too. After
a frustrating few hours of troubleshooting I discovered that timidity
is hogging the sound server.
Which brings us to the obvious question of how do you get Pulse to
play nicely with Timidity?