Channel imbalance? Do you mean overall? Or just certain instruments which were panned on the left? I did have the feeling when listening on speakers that in the part with the accordion the left guitar may have been a little louder, and at the end I thought the harpsichord on the left was louder than the piano on the right. I thought maybe it was just a fluke though since ironically I couldn't hear this on headphones. Maybe my suspicions were correct after all. I can adjust this in five seconds though and problem solved.
Remember that this wasn't recorded in extremely ideal conditions, with mismatched microphones and budget gear. Also remember I am an utter amateur.