How to Adjust Mac Volume and Brightness More Precisely

On a Mac that has a top row of function keys, Apple includes volume and brightness controls that can be used to make adjustments in stepwise increments. However, there may be times when you want to make more fine grained adjustments to these settings than the default increments allow – in which case, read on.
Whenever you tap the volume or brightness controls on your keyboard, you'll see an indicator appear on your Mac's screen with 16 fixed increments separated by lines. With the help of