Each resonator (Pharynx, nose and third) has a different sound. The lower resonator, Pharynx, creates a more edgy tone associated with the 'Chest Voice' timbre. The upper resonator (Nasal cavity) creates a softer and more flute-like sound. The third (front) resonator adds a strong sharp or 'bright' component to the voice.
Speech is usually resonated in quite random places within the vocal tract in accordance with the speaker's accent.
Singing voice is defined by the fact that it uses both
lower and upper resonator. (Sometimes referred to as 'First and Second' resonators respectively.)
Falsetto occurs when the lower resonator collapses or otherwise
ceases to function and we produce only the sound of the upper
When we shut off the upper resonator, through habit or intention, we produce sound only from the lower resonator. This creates a 'shouty' sound or 'speak-singing'.
The third resonator is a temporary one which we set up in the mouth (as opposed to the pharynx or nasal cavity) which alters the sound produced in the first / second
resonator combo to produce the acute vowels.
These are all resonator issues and have nothing to do with cord
closure.. except that when the resonators are working the cords will tend to close more readily.
Always concentrate on developing (allowing) the correct natural balance
between resonators and the rest will follow.
The only way to go after increased range and/or improved access and stability through the bridges is via correct, split resonance production beginning in the lower range.
Any time we shut off a resonator, we create a future moment at which it will need to activate again. At any such moment there is an artifact: a 'bump' or jerk or disconnection.