1. Amp Models - Spin this knob to select one of the Amp Models. The
LED will show red or green giving you two model types in each model
category. All the guitar tone and FX controls will automatically be set
to sound great with that Amp Model, so you can just play! When you
turn this knob the Display will briefly show the currently loaded Amp
Model name, along with the current settings of the Drive, Bass, Mid,
Treble, Ch Vol and Reverb knobs. Amp Models get progressively
heavier and distorted as you turn the model knob clockwise.