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.
How to Use a Guitar Pedal. Guitar pedals, sometimes called effects pedals, effects units, or stomp boxes, are small electronic units that alter your guitar's sound in a specific way. Traditionally, guitar pedals are used to produce special effects such as wah-wah, delay, tremolo, chorus, flanger, distortion, and fuzz.