The first exercise uses the vowel sounds "yah" and "ah ah." Feel your soft palate rise with the sound as you do when you yawn. And let your mouth open wide and the back of your tongue move down and forward. Pull the back of your throat wide open.
You can listen to the lesson on your computer by clicking the arrow on the audio player below. You can also download the MP3 file by clicking on the download link below the audio player.