Ever wanted fine control over your Mac’s Volume and Brightness keyboard controls? You can by using the ⌥⇧keys as well.
Most people know that you can control the output sound volume by pressing the F11 key to reduce the volume, and F12 to increase it. Sometimes at low levels I can’t get the perfect volume by just using the function keys alone. If you press ⌥⇧(Option and shift) and then press the function keys, your Mac will adjust the volume in quarter steps, rather than a whole step. Giving you fine control over the output sound level.
In the same way you can use ⌥⇧to provide fine control in quarter steps to your Mac’s screen brightness using the F1 and F2 keys as well.