Simple bash script to allow for control of Pulseaudio volume. Simply map the following to keyboard shortcuts in your DE or WM. Xfce4 allows for this under Settings > Keyboard > Application Shortcuts.
/usr/bin/pulseaudiocontrol mute ==> Toggle status of mute
/usr/bin/pulseaudiocontrol up ==> Increase vol by 5 %
/usr/bin/pulseaudiocontrol up 25 ==> Increase vol by 25 %
/usr/bin/pulseaudiocontrol down ==> Decrease vol by 5 %
/usr/bin/pulseaudiocontrol down 50 ==> Decrease vol by 50 %
/usr/bin/pulseaudiocontrol set 40 ==> Set vol to 40%
AUR package: https://aur.archlinux.org/packages/pulseaudiocontrol