For the rapid intake of of spoken responses it would be very useful for the local ChatGPT app to have the ability to speak at an increased rate.
For the interpretation and learning of spoken languages, especially foreign, it would be very useful for the local ChatGPT app to have the ability to speak at a slowed rate.
It is also desirable for rate control markup to be embeddable in responses to prompt. As an example, a rule stating that “responses in language XYZ contain ellipses between every word” could be used to indicate slow speaking to the app - the actual markup is worthy of careful design.