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.
How to Use a Loop Pedal. Using a guitar loop pedal can be as simple or as complicated as you make it. There are loop pedals with 5 different switches and there are loop pedals with only one. It all depends on what you want to do.