The five steps in teaching an employee new skills are preparation, explanation, showing, observation and supervision.
The thing is, if you believe in the unconscious - and I do - there's room for all kinds of possibilities that I don't know how you prove one way or another.
The goal is always to make a nice tableau painting with the voice. The more color I can find, the more shadow I can find - the goal is always to make more nuance and colors.