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Retrieving pitch profile with NSSpeechSynthesizer?

I'm using AppKit and NSSpeechSynthesizer to retrieve phonemes for a given string, but can't figure out how to get the dynamic pitch modulation that makes the voices sound more natural.

For example: https://developer.apple.com/library/mac/documentation/userexperience/Conceptual/ SpeechSynthesisProgrammingGuide/art/speechsynth_graph.gif

I assume the output would be lists where, for each phoneme there would be multiple durations and pitches. Since the pitch modulation is going to varry from word to word, I assume the data is in the dictionary for each voice. I just figure out the right API to use to pull it out.