IAudioEndpointVolume.SetMasterVolumeLevelScalar

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface IAudioEndpointVolume
@nogc nothrow extern (Windows)
HRESULT
SetMasterVolumeLevelScalar
(
float fLevel
,
ref const(GUID) pguidEventContext
)

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