Very useful tool for the times when you have to switch audio from for example build-it speaker to HDMI etc.
Tested on Linux Mint 17.1
Open a new Terminal window and enter the following commands:
sudo apt-add-repository ppa:yktooo/ppa
sudo apt-get update && sudo apt-get install indicator-sound-switcher
After install has completed open the start menu, search for ‘sound switcher’ and launch. It’s worth knowing that the app sets itself to auto-start on login, too.
If you don’t fancy adding the PPA you can grab the .deb installer from the package archive details page.