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.
A boost pedal is one of the most useful pedals one can have. Simply put, it boosts the signal that goes into it. It can perk up a low output guitar, or bring out more character or a different quality to your amp. This is especially useful for solos where overdrive or distortion would overwhelm the tone you've got.