Esther Salaman’s book ‘Unlocking Your Voice – Freedom to Sing’ describes the start of the note as a ‘caress of the glottis’, a ‘tiny click’ and ‘imploding’. Here are some sound files I made on a, i and u using the mechanism of the larynx. Salaman’s exercise for beginners is to take a ‘happy surprise’ breath, pause and onset a half scale on one breath.
These three vowels are followed by a preliminary agility exercises. This agility exercise should be performed lightly. Very little breath is required to perform them if the onset is a ‘caress of the glottis’, a ‘tiny click’ and ‘imploding’.