When you press the volume-up or volume-down key on your keyboard you will see a volume control indicator on your screen. There are only 16 steps and if you want to ‘fine-tune’ you will have to go to the system preferences and move the volume control slider pixel by pixel.
Well, not really. You can still do some fine tuning with your keyboard. Simply press and hold Shift+Option keys and then press volume-up or volume-down. The 16 increments will suddenly become 64, as each step is divided into four. See the rightmost white square on the image above, it’s only half-off, another notch would make it 3/4 off and so on.
You can also toggle the volume feedback sound by simply holding the Shift key while changing the volume with the volume keys. And if you really need to access the sound settings in the System Preferences, but feel somewhat lazy to reach for the mouse, just hold the Option key and press volume-up or volume-down on your keyboard.
