![]() Undulating notes are made by a combination of the tongue slowly vibrating while the throat pulsates the lung pressure, causing the sound to undulate smoothly at equal intervals.Ĭalls are derived from using individual scores or combinations of scores. ![]() Rattled notes are sounded by ballarding the tip of the tongue against the roof of the mouth, imitating a whistle rattled by a pee. Smooth notes are made as an ordinary whistle is blown and are raised or lowered by the lung force exerted. The number of seconds each pipe should be given under normal conditions is marked above the bar, but circumstances sometimes require that a signal be shortened. ![]() Intervals, or rests, are marked with a vertical line and the number of seconds noted above the line.
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