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.
Expression pedals work together with multi-effects units, amplifiers or synths to provide adjustment or generate additional effects. This gives you control over aspects such as wah-wah frequency or the timing of delays and modulation effects.long with the volume and expression rocker pedals, you'll also find some overdrive stompboxes amongst the selection here. With these, you can have pre-set tones, from subtle grit to serious distortion, that turn on and off in an instant.