Loudness Equalization (pretty self explanatory) Virtual Surround matrixes multichannel audio with Dolby Pro Logic (II supposedly?), for carrying over a single stereo signal Spatial Sound enables spatial sound API (Sonic is headphones only. Aside of that, choosing between it and Atmos should just be a matter of taste). Limits you to 48kHz. Dolby Atmos works only after app download (unlocking headphones requires purchase). HDMI is instead free (and contrarily to the past non-exclusive) Turn on 7.1 virtual surround sound tries to 'port' the sound output of conventional 5.1/7.1 programs to 3D, object-based, space. All of this should be available since some January 2017 insider build (Creators Update for stable). Both the latest two main points (aside maybe atmos on spakers? assuming that's a thing?), suffers from similar problems when shoddy-coded games just assume that if Windows reports X channels, then they ought not to output more, and user shouldn't have the slightest say on it.