Dear all this audio is given by mr.anuj ( a seniour member of delhi shg) . anuj want to learn speech therpy few year ago so they send a email to speech therapist of usa to learn online speech therapy. mr. anuj has a deep knowledge about how our vocal card generate the sound and how it work. this audio is one of them given by speech therapist. so those people have any queries related vocal card or this audio. please contact mr. anuj (9910103363).