Changes the rate at which text is displayed by the say and think functions. The newSpeed value is a percentage of the default speed (which is the number of characters in the string to be spoken plus 20). Therefore, a value of 200 will make speech appear for twice as long; a value of 50 will make speech appear for half as long.
Calling this function doesn't affect any speech which is already on the screen.
No return value.
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