Xubuntu 16.04 notification area and indicators glitch

Question

Recently updated my Xubuntu 15.10 to 16.04 and noticed that my panel missed tray icons for ktorrent. After some research I found trouble: notification area (системный лоток) has ktorrent tray icon, but it hides when I add indicators (индикаторы) and appears again after I remove indicators:

As you can see, the volume applet removes with removing indicators, it's not good.

I want to move the sound applet to the notification area and/or not have the notification area disappear when I add indicators. Is it mission possible?

Answer 1

Delete Indicators plugin, install xfce4-pulseaudio-plugin with command

sudo apt install xfce4-pulseaudio-plugin

and add it to the panel. You will have your volume controls without messing with the buggy Indicators plugin.

There is also an alternative version of Indicators plugin which uses GTK2 and has a classic tray behavior, it might be free of bugs.