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.
The wah wah pedal selects a portion of your sound, filters it and then accentuates it. The rest of the sound is reduced. Technicians refer to this concept as the bandpass filter. When you move the rocker up and down, the rocker turns the potentiometer.