H6-11
Illustrate manipulation of vocal formants.
Certain Tibetan monks are able to manipulate their vocal formants so that they sound like they are singing two notes at the same time. They sing a fundamental frequency of about 70 Hz, and manipulate their vocal system to produce formants at the fifth, tenth, etc. harmonics of 70 Hz. Because of this emphasis a note at 5x70Hz or 350 Hz sounds, two octaves and a major third above the fundamental.
H6, FS1

h6-11a