Unable to set SetDuckingPreference

[ReferenceType]

Hi
Im trying to do Stream Attenuation(Ducking), same as what skype does during call.
I am unable to set SetDuckingPreference on MMDevice, it doesnt change anything.

platform : Windows 11

What i did is :

defDevice.AudioSessionManager.OnSessionCreated += AudioSessionManagerOnSessionCreated;

private void AudioSessionManagerOnSessionCreated(object sender, IAudioSessionControl newSession)
{
     cc = newSession as IAudioSessionControl2;
    int hres =  cc.SetDuckingPreference(true);
}

where this device is used on WasapiOut.

Where i checked windows API for IAudioSessionControl2::SetDuckingPreference method (audiopolicy.h)
I dont know if you already implemented this or am i missing a hidden feature where i can activate Ducking.

Any help is appreciated.

Thanks

[ReferenceType]

Ok so upon some trial and error it seems you cant enumerate device and select even if its same device.
it only works on default with communication role

var outputDevice = new MMDeviceEnumerator().GetDefaultAudioEndpoint(DataFlow.Render, Role.Communications);

if you enumerate for same device, it wont duck.

   foreach (MMDevice wasapi in enumerator.EnumerateAudioEndPoints(DataFlow.Capture, DeviceState.Active))
       ...

So i cant provide options for user.

If you know a workaround please let me know.