This extension adds a little entry to the status-menu that shows the currently selected pulse-audio-output device. Clicking on that will open a submenu with all available output devices and let's you choose which one to use.

Since version 5, it also provides a shortcut to quickly switch output sources: <Super>+q

Most importantly this extension is as simple as possible. Therefore it does not include an input switcher or similar. See Audio-Input-Switcher (https://github.com/anduchs/audio-input-switcher) extension for microphone selection.

Either via

https://extensions.gnome.org

or via

git clone https://github.com/adaxi/audio-output-switcher.git ~/.local/share/gnome-shell/extensions/audio-output-switcher@anduchs

Then resart the gnome-shell via Alt+F2 then r and enable the extension using gnome-tweak-tool

To update later, just issue

(cd ~/.local/share/gnome-shell/extensions/audio-output-switcher@anduchs && git pull)

Originally authored by @anduchs.