Change headphone left-right balance on Android 7

What is the best way to set the left-right balance on a pair of earphones/headphones? I've looked into it, but I can't seem to find an easy way to do this. Does anyone know of a way to do this? I know very little about Android development, so a simple solution would be best (preferably an app). I am on a rooted Nexus 6P on stock Android 7.1.1