A lot of tutorials can be found regarding this topic if you only use a search machine.
https://www.pclinuxos.com/forum/index.p ... c=148994.0https://arcolinux.com/how-to-add-system ... inux-xfce/Download a sound scheme (as example the Smooth scheme
https://www.xfce-look.org/p/1187979/ ) and place it into /usr/share/sounds/Smooth
Change to the new sound scheme in xfcesettings

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-> sounds work
To add startup and logout-sounds follow the instructions that are given in the "/usr/share/sounds/Smooth/documentation/how to install on xfce.txt" file given that you use the mentioned Smooth sound scheme. But the instructions are applicable to all schemes:
For startup sound, create a new autostart application (Settings Manager or Control Center >> Session and startup >> Application autostart) with the following parameters:
- Name = Login Sound
- Command = canberra-gtk-play -f /usr/share/sounds/Smooth/stereo/desktop-login.oga.