Install xfce4-pulseaudio-plugin by entering the following commands in the terminal:
sudo apt update sudo apt install xfce4-pulseaudio-plugin
Description:
Xfce4 panel plugin to control pulseaudio
Xfce4 panel plugin icon to control Pulseaudio. You can use this applet to control your Pulseaudio volume levels with the media keys or using the scrollwheel. You can also open a Pulseaudio mixer via the plugin.
Homepage: https://docs.xfce.org/apps/pulseaudio-plugin/start
Version: 0.4.1-0ubuntu1
Section: universe/xfce