A correlation meter is one number for the whole mix. A walking sub and a wide top can still look fine. A phase fixer grabs the highs and shrinks the record.

Cohere shows the image by range.

Zones is eight named bands with a target width on each. Bands is the 1/3-octave map. Keep the floor in the middle. Let the body and the air open.

Put it on the mix bus. The mix keeps going. Cohere is a meter.

Use Live stereo coherence meter on the Plugins card too, so it sits with “Bass-safe spectral panner” and the rest.