Fadeout effect for a Source that is being deactivated

Jack0r

The Helping Squad
Just had the Idea, would it be possible to add a small fade out effect when you uncheck/deactivate a Source while being live?
Similar to the fadein when switching a scene.

Now that I think about it, a fadein when you reactivate the source would of course also be nice. But I would like to hear your opinions. Is it possible, do you see it useful? Would you use it?
 
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