Being a somewhat newer engineer, I’m curious how other producers are using the Curves plugins. After watching the tutorials and experimenting, I really think I am going to lean heavily on these plugins. As a general approach, I’m thinking: Curves AQ first, on individual tracks, and possibly on bus tracks here and there. Then Resolve on any competing tracks or sections that still need a tune up.
Equator is still kind of an outlier to me, but it seems like if I have AQ and Resolve running well throughout the mix, I should only need to slap Equator on Group Bus or the Mix Bus/Master Bus to find the right color for the whole track.
And a specific question, could AQ and Equator both be used on mix/master bus? Or would that be over-processing things? Highly appreciate any input 
It seems to me a pretty solid way to approach it. Though you have to be mindful that these plugins tend to incur a lot of latency, so you don’t want to be using them while recording as there will be obvious delays between striking the note and hearing it.
Another thing you want to look out for is they can be a bit processor intensive. Well, more intensive than a regular eq, but Equator is definitely high on the CPU. So you may want to tale advantage of “freezing” tracks if your processor is starting to struggle.
Concerning Equator, that kind of does a bit of what Resolve does in that it helps deal with clashing frequencies and it can be sidechained (linked) to another track so that it only triggers when the other track is playing. But it gives you more sound sharing control. Kind of like the AQ, but the AQ doesn’t allow you to deal with resonances in the same way.
So really, the Equator kind of sits between the AQ and Resolve. So you can use it in place of one of those two if you want a bit more control and access to resonance control which they don’t have.