Hi David,
Typically, there is no music or any extra sound involved.
Yes, the sound is something many people in our team are familiar with (iZotope RX, for example, several people are musicians, etc.), and ducking would undoubtedly work, I agree!
My personal take on it is to keep music out. Like in movies, if you can't have your score, the used "tunes" might get a different meaning in a different production, which could tint all previous work. Or the rights are reduced, like in one of my awarded movies (I got a license from Moby, but not for YouTube; that was quite painful to re-score it).
All that said, to give you some insight, we are widely spread with sound. Fingers crossed, it will be to your liking in the future.
Thanks again for the feedback.
Cheers