This option scales the pitch by a percentage value. If you set the scale to 0.5, that is equivalent to a downward shift by one octave. A value of 2.0 is the same as an upward shift of one octave. A value of 0.75 would make a woman's voice sound like a man's. 

Pitch scale controls 

Pitch scale: Ranges from 0.5 to 2.0.