Think of it as the "More" Channel....
Engaging the DRIVE 2 footswitch brings in the DRIVE 2 knob, allowing you to add distortion (in addition) to what's selected on the DRIVE 1 knob.
At the same time, the pedal jumps from the (pedal’s main, large) VOLUME knob level setting to a higher level selected on the DRIVE 2 VOLUME (mini-knob.)

• Dimensions: 4.45"W x 4.2"D x 2.5"H
  
• 16 gauge cold rolled steel enclosure.
  
• Based around the desirable JRC4558 chip and 1990’s Full-Drive circuit, with 2 toggle switches for many more sonic options.
  30% smaller than the FD2-MOS, 15% smaller than the FD3 at only 4.45" wide x 4" deep.
  
• 2 Footswitches:
  
  • Left ON/OFF footswitch: True-Bypass switching with exclusive Fulltone “Anti-Pop” circuit.
    
  • Right “Channel select” footswitch: switches between Overdrive 1 or Overdrive 2, each with individually adjustable Volume and Drive knobs.
    100% Built in the USA.
    
• 16 gauge cold rolled steel chassis with easy battery access via 2 thumbscrews.
  
• 9-18VDC operation, extremely green circuit only pulling 10mA of current.

Condition: Excellent. Light wear typical of a gently used Pedal. Light surface scratches, scuffs, etc. Box included.

This item comes with everything pictured.
Please feel free to reach out to our knowledgeable sales staff with any additional questions!