4. The method as recited in claim 2 , wherein a blended representation of the phoneme is generated by: multiplying waveforms of the first representation of the phoneme and the second representation of the phoneme by respective coefficients to generate a weighted simplified phoneme waveform and a weighted complex waveform; and adding the weighted simplified phoneme waveform and the weighted complex phoneme waveform to generate the blended representation.
4. The method as recited in claim 2 , wherein a blended representation of the phoneme is generated by: multiplying waveforms of the first representation of the phoneme and the second representation of the phoneme by respective coefficients to generate a weighted simplified phoneme waveform and a weighted complex waveform; and adding the weighted simplified phoneme waveform and the weighted complex phoneme waveform to generate the blended representation. 5. The method as recited in claim 4 , wherein additional blended representations of the phoneme are generated by: progressively modifying the respective coefficients to generate blended representations of the phoneme comprising progressively larger proportions of the first, relatively simplified representation of the phoneme.