Xfce PulseAudio Panel Plugin
The Xfce PulseAudio Plugin is a plugin for the Xfce panel which provides a convenient way to adjust the audio volume of the PulseAudio sound system and to an auto mixer tool like pavucontrol. It can optionally handle multimedia keys for controlling the audio volume.
See the file INSTALL for detailed instructions on how to build and install Xfce PulseAudio Plugin.