If you check the setting in iOS you will find that voice can be spoken in different people:
For example: en-US: the default is Samantha(female), there is Fred(male), and you also can download Allison, Ava, Nick... as well as Siri
How can we use them in speech.say()?
The propose is because that the quality of default voice of zh-cn is terrible which is read by Tian-Tian, but I check others like Ting-Ting or female Siri, the quality is much better.
Does anyone know how to change the setting?
Many thanks