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.
These sounds can be mixed with droning to create rhythms, which is how the Didgeridoo is used as a rhythm wind instrument. The Kangaroo Hop. Keep the drone going on the didgeridoo and quickly say the letter D. Tap the roof of your mouth with the tip of your tongue while you do it.