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.
Medical Transcription For Dummies. A foot pedal (also called a WAV pedal) is used in medical transcription because it enables you to control dictation playback with your toes. You can play, rewind, and fast forward by tapping different sections of the pedal with the front of your foot.