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.
Learn how to use the wah-wah effects pedal when playing the electric guitar in these free online music video lessons. Expert: Gary Schutt. Bio: Gary Schutt was born and raised in Monticello, NY, and was taught how to play drums by his father. He later learned to play guitar.