1. A method of machine-synthesis of electronic waveforms representative of the sound of a series of words stored as electronic data, the method comprising, automatically with a computer: (a) for each of the stored words, retrieving from a previously constructed database indicia of the patterns of syllables and their associated syllable prominences defining the word; (b) for each syllable for which indicia is retrieved in part (a), retrieving from a previously constructed database indicia of a pattern of posture spectra beats and changing spectra beats, and their associated beat prominences, defining the syllable, wherein (i) posture spectra beats refers to time segments in which a waveform is stable and (ii) changing spectra beats refers to time segments during which the frequency spectra are changing between consecutive posture spectra beats; (c) for at least some of the pairs of indicia referring to adjacent syllables, adjusting the indicia of the pattern of posture spectra beats and changing spectra beats retrieved in part (b); and (d) calculating and generating indicia of an electronic waveform comprising an audible representation of the series of stored words by adjusting a mean pitch value according to the sequence of indicia of the pattern of posture spectra beats and changing spectra beats retrieved in part (b), as adjusted by part (c); (e) wherein the indicia are suitable for audibly reproducing the stored words with a speaker device.