Megoldás KDE Notification Sound problémára:
1. Edit /etc/pulse/daemon.conf as root
2. Find
;flat-volumes = yes
3. Under it, type in the following (do not use a semi-colon) :
flat-volumes = no
4. Save the file.
5. In the terminal type in the following commands as your current user (not as root) :
$ pulseaudio -k
$ pulseaudio --start
Utána System Settings-Appl. and System Notifications- be lehet állítani a kívánt hangerőt.