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.
Modulation pedals: pedals that give modulation effect to the signal, i.e. chorus, tremolo, vibrato, phaser, wah (envelope filter or foot controlled wah), flanger, ring mod, etc. Delay pedals: duplicating the signal, with controllable time delay and repeat copies.