Controlling PulseAudio from terminal
1pactl set-sink-volume 0 +10% # raise volume by 10%
2pactl set-sink-volume 0 -10% # lower volume by 10%
3pactl set-sink-mute 0 toggle # mute/unmute
If using i3 , config can be
bindsym XF86AudioRaiseVolume exec "pactl set-sink-volume 0 +10%"
bindsym XF86AudioLowerVolume exec "pactl set-sink-volume 0 -10%"
bindsym XF86AudioMute exec "pactl set-sink-mute 0 toggle"