Okay, a long long time ago I tried to do something with a distance-calculating audio entity attenuator - something to make audio that got louder as you got closer to an object and prototyped it, but the downfall was that audio wasn't person-specific.  If there's a "Whisper" functionality... that would mean something of an *individual* audio channel in a weird way...  So... just holding out hope for individual audio based on parameters to control WAV audio volumes.