Question / Help Overlay Movement

I'd like to use caricatures of the faces for the participants of my stream in lieu of a face cam. The issue is I'd like to have the overlay bob up and down slightly with audio input to show who is talking.

I understand this will involve multiple overlays tied to different audio channels, my question is if it's even possible and, if so, how to set it up.

If movement isn't possible, perhaps switching to a seperate animated image while audio is detected?
 
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