At certain events, XFCE responds with a loud “beep” - when I open the shutdown dialog, when reaching the end of start menu items, etc. It’s the same kind of beep that comes comes when opening the BIOS config at boot.
I prefer a silent system and have been looking everywhere I can think of without finding any settings to switch it off.
Edit: XFCE is latest edition, 4.16
Does somebody here know?