So as I hear it she seems to be saying you sing a soft note and bring the weight of the abdominal mass up and the diaphragm goes up taking the air to the larynx ....the air comes before the sound. So ( this is me ) the lower abdominal muscles are used to pull in the stomach contents to support the diaphragm (which is relaxed?) after a large belly breath providing a constant source of air into the trachea and larynx. Its a little like blowing on a straw.
So as I hear it she seems to be saying you sing a soft note and bring the weight of the abdominal mass up and the diaphragm goes up taking the air to the larynx ....the air comes before the sound. So ( this is me ) the lower abdominal muscles are used to pull in the stomach contents to support the diaphragm (which is relaxed?) after a large belly breath providing a constant source of air into the trachea and larynx. Its a little like blowing on a straw.