Related (first includes audio recordings):

The scary sound of Aztec skull whistles (36 points, 1 month ago, 30 comments) https://news.ycombinator.com/item?id=42181466

Psychoacoustic and archeoacoustic nature of ancient Aztec skull whistles (62 points, 30 days ago, 33 comments) https://news.ycombinator.com/item?id=42213125

The craziest Aztec thing is clapping in front of those pyramids https://www.youtube.com/watch?v=cvC_deZuDDg