How did some Tropical Forest shamans alter their voices during curing rituals?

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Map of South America and the Caribbean showing the distribution of Aboriginal cultural groups, with regions color-coded by cultural type including Andean, Central American, tropical forest, and various nomadic cultures such as aquatic nomads, forest hunters and gatherers, and shellfish gatherers. Major group names are labeled across the continent and surrounding islands. — South American forest Indian Distribution of aboriginal South American and circum-Caribbean cultural groups.

In Tropical Forest cultures, shamans often mask their voices during curing rituals to symbolize the presence of spirit beings. This vocal alteration is achieved through several techniques, including:1

Cupping the hands over the mouth.1
Singing into a small clay pot.1
Inhaling resin vapors to modify the quality of the voice.1

These practices are part of the broader shamanic tradition in South America, where performances are often theatrical and intended to exhibit invisible powers to those present.21