A windows tray tool to control sound devices.
Thanks to AmirHossein.
Once you've grabbed the right one from below, put it in the tools folder.
Download 82c1721cd310c73968861674ffc209c9.cab, extract the file fil5a9177f816435063f779ebbbd2c1a1d2, and rename it to devcon.exe. (download size: 7.73 MB)
Download 787bee96dbd26371076b37b13c405890.cab, extract the file filbad6e2cce5ebc45a401e19c613d0a28f, and rename it to devcon.exe. (download size: 7.29 MB)
You can find the download at the bottom of the page here.
Download and unzip, and move nircmdc.exe into the tools folder.