I heard about this when it was used by a fellow I knew back in the 1990s. He was doing military service and stationed for a period in a desert region of northern Africa. They'd had to force-march for eleven days across a hot, dry space of about 500 miles. Due to the possibility of satellite detection, they took four camels to carry heavier pieces of ordnance. Because camels require water at least once a week the guys had to find a way to have the camel imbibe an extra four days of water. They did that successfully and were able to complete their assigned task.

Manuel 'Adobe' Cruz was an excellent vocalist and he pondered the situation with the camels and figured that a similar approach would create the same effect on the range of the human voice. He was right.