Alsa-Mixer is a gnome-shell extension to control ALSA output (Master) volume.
run install.sh or install from https://extensions.gnome.org/extension/903/alsa-volume-bar/git clone git://github.com/texasflood/Alsa-Mixer.git Alsa-Mixer cd Alsa-Mixer chmod u+x install.sh #You may or may not need to do this ./install.sh
And then restart the Gnome shell
This is an updated version with a bug fix, the original code was written by Victor Aurélio Santos. The bug fix is related to a corner case, when the volume reaches 100%, the extension crashes as the regular expression does not handle three digits. In normal use, when the volume reaches 100%, the volume controller crashes. I have also added a simple mute detector.
To mute/unmute without closing the menu, toggle the Sound switch with the spacebar.
License GPLv3