How to split audio between Windows Mixed Reality or VR and PC speakers

[Windows Central]

Treat spectators to the same sound you're hearing in your Windows Mixed Reality of VR headset.
Half the fun of VR experiences is letting others watch while you play, but it isn't the same when they can't hear what you're hearing. You might also just have an insane surround sound system that you want to test out with a 3D video or game. In these cases, you'll likely want to split the experience's audio between VR and some external speakers. Whether you're using Windows Mixed Reality (WMR), Oculus Rift, or HTC Vive, here's how to mirror your VR audio.

Full story from the WindowsCentral blog...