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AKRESULT __cdecl AK::SoundEngine::SetSecondaryOutputVolume ( AkUInt32  in_iOutputID,
AkAudioOutputType  in_iDeviceType,
AkReal32  in_fVolume  

Set the volume of a secondary output device.

in_iOutputID  Player number (almost all platforms) or device-unique identifier (UserID on PS4).
in_iDeviceType  Device Type, must be one of the currently supported devices types. See AkAudioOutputType
in_fVolume  Volume (0.0 = Muted, 1.0 = Volume max)