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.
When a pedal is meant to be played, put the heel of your foot on the ground directly in front of the pedal. Pivot downwards, pressing down the pedal with the broad ball of your foot. Your heel should not leave the ground while depressing a pedal.