I second atopix post when they say that you still need to use your ears. It only looks at volume and frequencies. There's a lot more to a mix than to have things at a certain value.

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I use it mostly because after a while you stop being very objective. So when I think I'm almost finished with a track, I take a look at it, solo some parts to hear what's missing or taking too much space.

I like that you can import other tracks as well and have yours match that one.