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How does a duct guide air through an ocarina?

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toad ocarina — vessel flute Toad ocarina, slip-painted ceramic, Nopiloa, southern Veracruz, Mexico, 700–900 ce; in the Los Angeles County Museum of Art.

The ocarina, a type of globular flute, uses ducts to direct air from the blowhole to the edge of the instrument. This design is characteristic of fipple flutes, where a duct or fipple guides the player's breath against a sharp edge, causing the air to vibrate and produce sound.12