Works, and works in Yosemite.

Was looking for a convenient way to control a multiple output device (in my case usb/dac driven speakers and a subwoofer which runs off Mac Pro built in Line Out). Reason being that after creating multiple output device in the Midi Audio Setup control panel, you are no longer able to control the volume by media keys on the keyboard, nor with the menu bar widget.

This allows me to control each output device separately, and most import from the menu bar - which yes, you could always do it, but had to get into the Midi setup panel.

App also creates its own multiple output device, so you dont necessarily need to do it yourself. Just select the devices you want to add to it, without having to drill down into the pref pane to do it.

Also allows you to choose the default audio device to set it as the default, much like option clicking the normal volume icon does.

nobody0101 about AudioSwitcher