Single formants are the foundation of the double formants

Learning the [u] with a low larynx helps to effectively develop the musculature needed for anchoring the larynx into a low, fixed position. One that is effective for achieving efficiency and resonance. Rounding (without the lips) the [u] seats the larynx and induces air-flow through the vocal cords. The single formant vowels behave like a flue; working in perfect balance with the steady emission of air by means of Bernoulli's principle in action. Single formants build their ability to create dark sounds in a way that induces air-flow. Many who implore darkening of the tone, do so at the expense of efficiency, as weight is normally a result of darkening a "supported" tone. Learning the single formant vowels as being conceptualized primarily as a speaking tone will allow any student to warm the voice easily, as if opening and closing shutters. How do we say words like: you, new, Sue, do, flew, two, grew, stew? If you'll notice, there is also a ring or resonance to these sounds, in some words this ring is intensified by the use of the semi-consonant in words like new, and stew. This suggests to me that this [u] position could be a more natural position by which to approach developing the ring of the voice. One way to do this is by employing our ability to create double formant vowels as [i]s, [ɛ]s, and [æ]s. Further, a smooth connection between the fundamental qualities of both single and double formant vowels allows for seamless phonation through the multi-syllabic dynamic of singing. It does this by allowing the singer to change syllables without ever changing the airflow and disturbing the action of Bernoulli's principle.