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Have you never played around with your group fx/ send fx/ (whatever you'd like to call them) tracks?
Do you set up a master reverb and send varying amounts of various instruments into it? Your DAW should allow you to do whatever you want with that reverb - EQ it, add chorus/ phasing, and yes, automate the level - either by drawing in automation or by using a sidechain compressor or probably a whole number of other ways.
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