Switch between your input sources and output devices.
To install just download and double click the .alfredworkflow file.*
To change your input source type input (it could take a little bit to load your sources), then select the one you desire
The same for the output device, just type output then select your choice
Since I don't have any audio device or source connected to my laptop only 1 (the default) device and source are shown.
*You need to get a Powerpack Alfred License to install extensions