3. A method, comprising: receiving text data; determining a first text segment of the text data, the first text segment including a first number of different phonetic units; determining a second text segment of the text data, the second text segment including a second number of different phonetic units; determining the first number is greater than the second number; sending, based on the first number being greater than the second number, the first text segment to a first proofreader through a communications interface; receiving feedback on the first text segment through the communications interface; adding, based on the feedback, the first text segment to a text-to-speech (TTS) corpus, the TTS corpus comprising approved text segments; determining a third number of different phonetic units of the TTS corpus comprising the first text segment; determining the third number is less than a desired number of different phonetic units of the TTS corpus; and sending, based on the third number being less than the desired number, the second text segment to a second proofreader through the communications interface.
7. The method of claim 3 , wherein the feedback comprises a correction to the first text segment.