Illness, lack of sleep, or fatigue will not help you attain a good result.
The high tone vocalization would add some more glory to the vocalization you acquired through the training, and it is the sign that you have overcome one of the vocal impairment.
VI. A VIEW ON HIGH TONE VOCALIZATION
To make conclusion in the very beginning; in the esophageal speech voice is produced by the vibration of the gathers in the upper part of the esophagus when the air inhaled into the esophagus is exhaled. The idea of high tone is to make the outlet as small as possible when vocalizing, and to coordinate various movements of the sound tract to attain higher tone.
How to make the outlet smaller and make the voice higher; it is easily said, but difficult when it comes to practice. It can be described in the following example; Connect a faucet and a rubber hose, and let the water out.
