Get or set a synthesizer’s baseline speech pitch.
- macOS 10.5+
NSNumber object that specifies the baseline speech pitch. Typical voice frequencies range from around 90 hertz for a low-pitched male voice to perhaps 300 hertz for a high-pitched child’s voice. These frequencies correspond to approximate pitch values in the ranges of 30.000 to 40.000 and 55.000 to 65.000, respectively.