Everyone has a range between the highness and lowness of their voice during normal conversation. this level is referred to as your

habitual pitch

Explanation:

The habitual pitch is the term which is used to define the average pitch that a person uses to speak or it is the fundamental frequency that is used by the person. It is the highness or lowness of the voice used for the purpose of conversation by the person. Optimum pitch is the level at which the voice is most suitable for comfortable speaking. Voice strain or pathology will occur when the habitual pitch is different from the optimal pitch.  

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