One of the easiest ways to achieve proper volume levels for a given track of music is to measure the size of the center image.
I am not suggesting some sort of magical measuring apparatus. No, it's simpler than that.
All one needs to do is turn the level up or down until the center image is of a lifelike size.
A voice sounds like it's coming from a person.
Too loud and the voice is too big. Too soft and the opposite.
It's a simple formula but one that seems to escape so many.
Size matters when it comes to level.