Install Pavucontrol

pavucontrol - A volume control for the PulseAudio sound server

Ubuntu

$ sudo apt-get install pavucontrol

Or QT Version

$ sudo apt-get install pavucontrol-gt

Arch

$ sudo pacman -S pavucontrol

Or QT Version

$ sudo pacman -S pavucontrol-gt

Fedora

$ sudo dnf install pavucontrol

Or QT Version

$ sudo dnf install pavucontrol-gt

OpenSUSE

sudo zypper install pavucontrol

Or QT Version

sudo zypper install pavucontrol-gt

Source: AddictiveTips