Search notes:

mmsys.cpl

Audio Control Panel
The control panel has four tabs. The individual tabs can be opened from the command line like so: 
control.exe mmsys.cpl,,0   rem    Playback
control.exe mmsys.cpl,,1   rem    Recording
control.exe mmsys.cpl,,2   rem    Sounds
control.exe mmsys.cpl,,3   rem    Communications

TODO

What is the relation to HKEY_CURRENT_USER\AppEvents\Schemes\Apps and HKEY_CURRENT_USER\Control Panel\Sound.

See also

Turn off sounds in the registry.
SndVol.exe

Index