Shelf controls
When you add a shelf control, it appears on a three-dimensional shelf. You can move the shelf, adjust the angle of the shelf, and place multiple shelf controls on the same shelf. For example, if you have a keyboard screen control in your layout, you can add pitch bend wheel and modulation wheel screen controls to the same shelf as the keyboard screen control. Shelf controls include:
Keyboard
Modulation or pitch bend wheel
Sustain pedal
Foot pedal
Foot switch