Just use VoiceMeeter Banana, you can set window sound to VB Cable or HiFi Cable and set it as a VoiceMeeter input, then you will have sound from everything at once.
Set BB to VoiceMeeter ASIO and Cubase to VoiceMeeter AUX ASIO.
Set VoiceMeeter Output to the main audio device attached to your speakers.

https://www.vb-audio.com/Voicemeeter/banana.htm
https://www.vb-audio.com/Cable/index.htm

Last edited by Pipeline; 04/07/18 08:45 PM.