4. The computer-based method of claim 1 wherein the particular one of the phonemes whose audible duration is set corresponds to a grapheme that appears on another one of the grapheme-labeled regions other than the particular one of the grapheme-labeled regions.
4. The computer-based method of claim 1 wherein the particular one of the phonemes whose audible duration is set corresponds to a grapheme that appears on another one of the grapheme-labeled regions other than the particular one of the grapheme-labeled regions. 6. The computer-based method of claim 4 further comprising: in response to the pointing device touching a grapheme-labeled region that corresponds to a phoneme with a pronunciation that is not sustainable: introducing a delay before producing the phoneme associated with the touched grapheme-labeled region, if pronunciation of the phoneme corresponding to the grapheme-labeled region cannot be extended; and initiating pronunciation of a subsequent phoneme without delay.