Diagram of normal sinus rhythm as seen on ECG. In atrial fibrillation the P waves, which represent depolarization of the top of the heart, are absent.
The wah-wah pedal is based on a simple concept but its effect is far more dramatic. Using a powerful filter to sweep through a broad frequency spectrum, the wah pedal boosts and exaggerates specific tones. Creating sounds that range from thick, flubbery bass to scratchy, stinging treble.
Listen to the classic recordings of Jimi Hendrix and Eric Clapton where the CryBaby wah pedal is used extensively. After listening to the sound you will begin to recognize the CryBaby in just about every rock, funk, and blues player's repertoire. When using a lot of distortion, the effect will not be as prominent.