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.
producing a muted, bawling sound like that of a trumpet with the hand moved momentarily over the bell: a wah-wah effect on a synthesizer; a guitar with a wah-wah pedal. noun. 2. a sound or effect like the muted sound of a trumpet, especially in music. 3. an electronic device or attachment to produce such a sound, often used with an electric guitar. Origin of wah-wah.