switchaudio-osx 0.0.1-unofficial (new formula)

This formula provides the OS X command line utility
SwitchAudioSource. Users will be able to switch audio sources
(input/output/system) using the command line and without needing
a GUI tool. It works with 10.7 Lion, 10.8 Mountain Lion, and 10.9
Mavericks.
I’m in touch with the fork above this one. The upstream of that is not maintained any longer that I can see and the former project home at https://code.google.com/p/switchaudio-osx/ points to the upstream of the above fork.