Findings:

• Romancing the brake pedal
• Wah-Wah
• "Dude! How did you get that tone?": Guitar Effects Pedals and Processors (category)
• Eggbeater pedals
• Pedal steel guitar
• Guitar effect pedal construction
• Portland Bridge Pedal
• CH pro pedals
• pedal tone
• Safety Pedal Cluster
• gas pedal
• wah wah pedal
• volume pedal
• pedal car
• The Principles of Leverage, or A Pedal Powered Himalayan Jaunt
• Pedals in FPSs
• clipless pedals
• pedal point
• pedal pushers
• Look Pedal
• PeDal (user)
• soft pedal
• guitar pedal
• effects pedal
• brake pedal
• foot pedal
• Pedal
• sustaining pedal

If you Log in you could create a "wah-wah pedal" node. If you don't already have an account, you can register here.