How to handle audio ducking in a osx application, does osx provide any notification for handling audio ducking?

When voice over is working it audio ducking will happen it will reduce my app volume too. Is there any way to handle audio ducking?, when voice over is complete its speach, app volume wont get back. In my app created my own audio device demon for enhancing audio. Is there any solution for it?

How to handle audio ducking in a osx application, does osx provide any notification for handling audio ducking?
 
 
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