Amplitude Versus Decibels

Amplitude is a convenient way to describe the loudness of sound mathematically. But audio engineers typically use "decibels" instead. Decibels correspond more closely with the way that humans perceive loudness.

decibels = 20 * log(amplitude)

To do:

Move the amplitude fader back and forth.
Notice how it gets loud right away when moving from left to right.
Move the decibels fader back and forth.
Notice how it is easier to adjust low volume levels using the decibel fader.