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Speaking rate/speed, in the range [0.25, 4.0]. 1.0 is the normal native speed supported by the specific voice. 2.0 is twice as fast, and 0.5 is half as fast.
Device profiles are audio effects that are applied on (post synthesized) text to speech. You may need to experiment with different profiles to find the best sound output for your application, we recommend to sign up to avoid limitations.