The Korneff "El Juan" is a very powerful problem-solver. I use it in every mix, BUT NOT on every channel!
You can bring nearly any channel upfront and centre in that way everybody is used to listen to. So if your vocals are allmost ready to print, but still lack that last 5% of commitment - El Juan can do the job and level up.
The same result on guitars or horns. But you do have to decide which channel should be upfront over others. Then you will be very happy with this "Don Juan" on your channel…