Somtimes you have to adjust the balance settings and need to go to the sound panel. Normally you have to go throug the system preference settings. With this shortcut its easy and fast.
Hold down the alt key and press 1 of the volume keys. For example alt+F10 or alt+F11 or alt+F12
Its handy to know this because it seems that with my macbook sometimes the balance is a bit off and i need to adjust it to the center. Overal i still like the mac because its so user friendly.
Thanks for reading :).