How To Use Voicemeeter with a Hangout On Air (HOA) including system sounds
Channel: Creator's Media Tools
Date: 2014-09-28

Microphone AND System Sounds to an HOA! 
This video covers using the Voicemeeter application, a virtual mixer, and a virtual audio cable to bring in the Hangout on Air audio for monitoring without sending it back out to itself, while still sending both a Microphone and one's system sounds out to the broadcast.

Voicemeeter program:
http://vb-audio.pagesperso-orange.fr/Voicemeeter/

VB Virtual Cable
http://vb-audio.pagesperso-orange.fr/Cable/index.htm