Summary:
Registration has a lot of connotations and can be very controversial in vocal pedagogy. McCoy uses the definition from Manuel Garcia to describe the two registers. They each have their own set of pitches that are produced in the same way physiologically and have very similar timbres. He uses the names "mode 1" and "mode 2" to describe. Mode 1 uses the TA muscles to thicken the folds which creates a square shaped glottis. Mode 2, on the other hand, uses the CT muscles to elongate the folds so the glottis is more triangular shaped and there is less contact between the folds. The switch from M1 to M2 occurs at different places in the male and female voice and varies even within voice types.
Application:
Understanding what is happening physiologically as we work with our students on consistent timbre, registration, or however else we like to think about it, can help us choose effective vocabulary. While terms like head and chest voice might be very effective for many students, it also can carry with it certain connotations about what it should sound or feel like. Understanding the physiological process can also help us design effective exercises to help students target where they are struggling.
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