I'm running xubuntu 16.04, and I have noticed something strange. Whenever I change the volume, there is no tone that sort of lets me know how loud it is. It makes me think that my sound is not working when it is. I have to go to youtube or something just to confirm.
I tried looking aorund but it seems like a strange problem so it's hard to find. Any help is appreciated.

pavucontrol) even without installingsoxandgnome-session-canberra. I can confirm this. The problem is with how Xubuntu handles notifications from the system tray. Check this related question. I think it is a bug in the distro. Can you please tell me if you see the brightness indicator notification when you try to change the brightness from the notification panel by scrolling with your mouse (not by keyboard shortcut or dragging buttons within the applet)? – Nanashi No Gombe Jul 3 '17 at 20:50