Windows 10: The audio output device setting in 'App volume and device preferences' doesn't actually...

In 'App volume and device preferences', I set an output audio device other than the default device for my app. I then closed and reopened the application for my change to take effect.


Windows 10 did remember the sound devices I assigned to the individual app whenever I launched the app. But my app will not output to the assigned audio devices at all. It persists to output to the default one.


What's wrong?


My app is simple enough. It's a console application written with C#.


var synthesizerMy = new SpeechSynthesizer;


//synthesizerMy.SetOutputToDefaultAudioDevice;


synthesizerMy.Speak"Are you ready?";


synthesizerMy.Dispose;


And I am sure that the driver of this assigned audio device works well. When I change the default output audio device to it, my app then will output to this usb audio device.


So, I wonder why the output setting for my app in 'App volume and device preferences' does not work at all.


My Windows 10 Pro is Ver. 1909.


Thank you for your advice.

:)

 

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