It's the perfect utility for making sure when plugging and unplugging headphones that the audio stays centred. It was designed out of frustration of the long standing OS X bug where the audio balance can randomly move away from the center.

Download the free 10 day trial with full functionality to try out these fantastic features.
Balance Lock will keep the audio balanced in the middle so you don't have to worry about checking the System Preferences every time you plug or unplug your headphones.
It runs in the background and wakes up only when the audio balance changes. So there's no excessive CPU usage or slow downs.
Get an optional notification when Balance Lock restores the audio balance to the center after detecting that it has drifted to the left or the right.
Balance Lock includes simple to use preferences so you can adjust it to the way you like.
A simple to use status menu is always available from the menu bar. So you can easily turn it on/off, send some feedback, change the preferences or

Compatibility: OS X 10.10 or later, 64-bit processor

Home Page - https://www.tunabellysoftware.com/balance_lock/