SSD - SetSoundDevice sets the output sound to multiple audio devices, it allow you to output sound to more than one audio device.
To call SSD from the commandline, the syntax is 'SSD.exe #' (where # is the number of the Sound Device to select from the list,'Select Default' dropdown box must be enabled to make device selectable).

The license of this software is Freeware, you can free download and free use this audio utility software.