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PKEY_AudioEndpoint_Default_VolumeInDb

In Windows 10 Version 1605 and later, the PKEY_AudioEndpoint_Default_VolumeInDb property key configures the default volume (in dB) for the software volume node. Provide the default dB value that you would like to set.

If an audio driver doesn't implement a hardware volume node for an endpoint, Windows inserts a software volume node to control volume on that endpoint. There are situations, where the default volume value is too low. This settings information (INF) key provides the user a better experience when appropriate gain or attenuation is applied to audio signal.

Remarks

You can override the default software volume value for an endpoint by setting PKEY_AudioEndpoint_Default_VolumeInDb on a topology filter using the driver INF file. The value specified by the key is in dB units.

This key is used for both render and capture endpoints.

This key is ignored if the endpoint implements a hardware volume node.

Any value can be set, but Windows makes sure that the value it is within the min and max value settings. For example, if the specified value is greater than the max volume value, Windows sets the default value to the max volume value.

The data is stored as a 16.16 fixed point value. The upper 16 bits are used for the whole number of the value and the lower 16 bits are used for the fractional portion of the value.

INF File Sample

; The following line overrides the default volume (in dB) for an endpoint. 
; It is only applicable when hardware volume is not implemented. 
; Decimal value expressed in fixed point 16.16 format and stored as a DWORD. 

PKEY_AudioEndpoint_Default_VolumeInDb        = "{1DA5D803-D492-4EDD-8C23-E0C0FFEE7F0E},9" 

; 10 dB 
HKR,EP\0,%PKEY_AudioEndpoint_Default_VolumeInDb%,0x00010001,0xA0000 

;-10 dB 
;HKR,EP\0,%PKEY_AudioEndpoint_Default_VolumeInDb%,0x00010001,0xFFF60000
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