Balance control. Discuss.

because your room or your hearing acuity might not be perfectly symmetrical.

Your recordings may or may not be ideally balanced for your setup (equipment and room) and your hearing. As such a balance control can act as a fine focus control for soundstage and imapging info. The balance control should be useable from the listening position.

My pre doesn’t have a balance control. There are times when I would use it to correct for a recording’s image position within soundstage.