I was just playing around with a stereo imaging tool when I came upon something I don't really understand. When an instrument is dead center, presumably (Correct me if I'm wrong at any point), it sounds dead center because it is playing equal volumes out of each speaker, making the brain perceive it as center. However, when I took the imaging tool, and panned one track hard left, and the other hard right (The same track just copied), they sounded like they were very far apart, and not being heard in the center at all, even though they were presumably the same volumes on each side. Why does this effect happen? What causes this?