How do you implement the Endpoint Submix and UAudioEndpointSettingsBase?

How would you implement the Endpoint Submix and UAudioEndpointSettingsBase? It has nothing in it except for an empty interface; what information do you have to give it for it to translate to an audio device output?

Thank you in advance!

Answer posted here: Routing Audio to Different Hardware Audio Devices - #2 by tomato_tomatoes

TL;DR, the feature’s probably not ready for full implementation yet, although functionality to route audio to gamepad exists!