Another thing I’ve come to be wary of is having too many mid/side splits in the chain. 1 is invisible, 2 usually still is super transparent, but going beyond that can sometimes lead to a loss of definition in the stereo field, like the space between the mid and the sides gets hollow. Same goes with multi band processing. One or two can be very useful (though I try to steer clear of it completely these days) but start piling on multiband stuff and things can deteriorate. Generally when mastering for other people I try to keep to the motto of “Do no harm”

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