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?

AUTHENTIC AZTEC CRAFTSMANSHIP: Made by indigenous Aztec artist Rafael Itzcoehua and team. LOUD AND FEAR-INDUCING: Bone-chilling power of over 125+

Real Screaming Aztec Death Whistle by ITZCOEHUA - Loudest Authentic Human Sounding Screams 125+ Decibels Loud, Collectible, Aztec Design in Obsidian

Aztec death whistle - Wikipedia

The Sound of Dread: Listen to the Aztec Death Whistle, the World's

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

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