Video is intentionally silent. Get Wotja & try it!
It is easy to dynamically change the Desktop Audio Output used by Wotja, but it must already be present on your system and available as an output.
Go into Wotja Settings > Audio MIDI+ > Audio Output > Output Device, select the device you wish to use and tap OK.
Note: If you change your Mac/PC to use a different Audio Output device (or you add one) you will probably need to restart Wotja before that Audio Output device can be selected and/or used by Wotja.