Talking without moving vocal cords in DGSD

There is a character in DGSD named Duan Yanqing, he could talk without moving his vocal cords ( I am not sure if that was the right words. It is what we normally do when we speak). I wonder if JY has written, what it was called or how it done?


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I’ll need to check the text. From what I recall he channels inner energy to his lower Dantian