http://www.youtube.com/watch?v=pcdsTqCQ0F0
Guitar Lessons : Guitar Pedals & Effects
via eHow:
A guitar effects pedal can create many different sounds, and two commonly used pedals are delay pedals and wah-wah pedals.
Learn about using a wah-wah pedal in lead guitar playing with help from an electric guitar instructor in this free video on guitar pedals and effects.
Expert: Chris Dupre