How Did Ancient Aztecs Use the Haunting Aztec Death Whistle?

Some claim the "haunting shrieks" of the death whistle were used to terrify the Aztecs' enemies in battle or to mimic the death cries of sacrificial victims to their gods. But does anyone know its real use?

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How Did Ancient Aztecs Use the Haunting Aztec Death Whistle

Strange Haunting Sounds of the Aztec Death Whistle - Archaic Roots