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?

Listen to the Aztec DEATH WHISTLE that may have accompanied human

3D Printing Resurrects the Aztec Death Whistle - 3D Printing

The Aztec Death Whistle Artefact History – Origenous

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The 'death whistle

Aztec Death whistle, for sale mayan flute,black pottery, musical instrument,handmade,scary

The Aztec Death whistle original hand crafted piece | First Nations Music

Strange Haunting Sounds of the Aztec Death Whistle - Archaic Roots

The 'death whistle

The Enigmatic Aztec Death Whistle: History, Culture, and Mystery