is the average pitch at which a person speaks Articulation
Oral cavity
Inflection
Circumflex
Key
Larynx
Diaphragm

Hey :)

I have two suggestions not sure which one it is (sorry)

1) Circumflex

The circumflex has its origins in the polytonic orthography of Ancient Greek, where it marked long vowels that were pronounced with high and then falling pitch. In a similar vein, the circumflex is today used to mark tone contour in the International Phonetic Alphabet.

2) Inflection

Inflection most often refers to the pitch and tone patterns in a person's speech: where the voice rises and falls. But inflection also describes a departure from a normal or straight course.

Hope this helps tho!