Xfce4-pulseaudio-plugin Version 0.2.5 My system is Qubes OS R4.0 Plugin button to test audio at the current volume or at least play a sound at the current volume when the user releases a mouse click from the volume bar. In windows, if a user clicks on the audio bar, it plays a sound at the new volume so that they can verify they like the new volume and to notice if their speakers are working at all. This is especially important in my distro Qubes OS, where the Xfce4-pulseaudio-plugin manages audio for the whole computer, while most applications are in sandboxed virtual machines. If a VM can't play sound, it is important that I can use the Xfce4-pulseaudio-plugin to troubleshoot if my issue is with my VM or the pulseaudio. My workaround was after wasting time searching the internet, I had to ditch the GUI and use the console to run `speaker-test`. If needed, Xfce4-pulseaudio-plugin could add a button to run `speaker-test` in the background at the current volume. https://github.com/QubesOS/qubes-issues/issues/3999