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.
Photo Credit kadmy/iStock/Getty Images. Bike pedals come in an array of types and designs, but most pedals screw into the crank with a 15 mm pedal wrench. A few pedals need a 9/16-inch wrench, or even a 6-mm hex wrench to use on the back of the crank if they don't have flats on the axle.