Out of date information. Be careful with this one
Customer Rating: 




I bought this book second hand. It is full of the sort of out of date information that I sort of expected from the welter of self publication that surrounds it.
There has been an extraordinary amount of voice research published in the last 25 years, and that which does not support the central premisis of this book doesn't surface in the text.
The vocal folds simply do not zip up to provide pitch transitions. I have asked the authors for a reference to stroboscopic evidence of the zipping of the folds and I never got an answer. This is because the vocal folds don't zip up. They elongate to produce higher pitches.
And what is more, the larynx rises with pitch change. It's a natural response to the the pitch - just try it yourself. Put your hand around your throat and say mmmmmm moving the pitch up and down and feel the movement that has happened in your larynx since birth.
Read about it these and other voice issues on the NATS website where there are lots of informed articles on voice. You may decide you want something a bit less personality centred and rather more accurate.