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.
Morley Steve Vai Bad Horsie 2 Contour Wah Pedal. This wah pedal is one of two Vai is known for using over the years. His other choice is naturally a Dunlop, but Bad Horsie 2 is the pedal he helped design in cooperation with Morley.