I have KDE as the window manager, and I cannot figure out how to stop it making ding-a-ling noises at extreme volume. Example:
- Open Konsole.
- Open a second tab.
- Close the whole window with its × button.
- A message box interrogates me, asking if I really want to close both tabs. The message box resets the system volume from where I need it for my headphones, ~10%, to 100%, and then emits a pointless ding-a-ling noise. It's horrifyingly loud. I jump every time.
I haven't done anything weird with the sound settings to cause this. Linux has behaved this way since I set it up a month ago.
Question: Where is the checkbox to turn off KDE's noises? It was easy to turn off the sound theme when I used Windows, but I feel like I've looked all over KDE and never found the setting. Currently I live in fear of clicking things that I know will make the noise.
System: Debian Stretch 9.5
KDE: Plasma 5.8.6