With the anytune app you can control the speed of a spoken sample without changing the pitch (how high or low the voice goes). Or you can change the pitch up to an octave, and not change the tempo. Or change both! If you use recorded speech to teach English, or to learn English, this app makes it possible to slow speaking down, but keep intonation natural!
http://www.anytune.us/slow-down-music-perfect-pitch/
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