TheGodOfRainbows wrote: ↑13 Apr 2018
Very interesting device. I like this from the manual: "A well correlated stereo mix will be an ovular shape (tall and narrow) and centered on the vertical M axis."
Does this mean you can see problems you can't hear, but will manifest in some way in different listening conditions?
Yes, CORE's Goniometer provides a visual representation of the "stereoness" of a sound source. The image displays how much mono (vertical M axis) and stereo (horizontal S axis) information is present in your mix to help identify possible phasing (cancellation) issues. If certain sound get quieter or vanish when you sum a stereo mix into mono (turn width knob all the way left), then you know you have phase problems. This can be problematic in certain listening environments where the stereo field is not ideal or when the song is played in mono (i.e. stores, clubs, some blue tooth speakers, etc). In fact, play a few modern radio songs through CORE and you'll see how little stereo information is present in well balanced and mixed songs.
Voyager wrote: ↑13 Apr 2018
In my opinions if you have the right environment and tools to work with at the end the best judge remains your ears. For phase scenario and mono compatibility issues having a grotbox will make your life in studio way more easier than before.
Yes, the right environment, speakers and well trained ears are important; however, ears can deceive even in optimal conditions, so Correlation meters and Goniometers are there to ensure you don't over do it on the stereo width or miss any phasing issues.