I would use this feature to “dim” effects while the vocal is prominent and raise the effects level after they have stopped singing. Sort of a way to ride the reverb tail automatically. Or have the vocal reverb tail diminished while a guitar was playing to clean up the mix a bit. When guitar stops the vocals will get wetter.
How about a kick drum modulating the guitars in a mix?
We have done that in the studio world for years with tight compression on the verb send…Not at console but would have to see if that routing is possible. I wished there were some things like this available also like a graphic on the IEM/Wedge channel for room tuning in a control room situation…