This property specifies the average frequency of the speaking voice. Different voice families have different average frequencies (a male voice is approx. 120Hz, a female voice is approx 210Hz.)
Explicitly sets the value of this property to that of the parent.
x-low, low, medium, high, x-high:
These do not map to absolute frequencies since they are dependent on voice family. The obvious scale between values should be maintained no matter the voice family.
Positive number indicating average voice pitch measured in Hertz or Kilohertz.