History: What does amplitude do in distortion?

What does amplitude do in distortion?

• Amplitude impacts the shape of the distortion.
  The shape of distortion has a variety of factors.
• There is no amplitude in distortion.
  Nope.
• Amplitude impacts the color of the distortion.
  It can, but another answer is more likely...
• Amplitude impacts the intensity of the distortion.
  Perfect!