Web Browser Experimental Audio Sound Class Used?

I have code that currently controls the various Sound Classes that I have deployed into a map. I have begun using the Experimental Web Browser in my level for streaming in content. I don’t know which sound class to try and control with my UMG sliders I have built. Does anyone know the sound class that the Web Browser would be using? I had a cursory look at the C++ for the Web Browser but it wasn’t evident.