13. A computer program product tangibly stored on a computer readable hardware storage device, the computer program product comprising instructions for causing a processor to: cause a user interface to display an electronic representation of a document, where a first portion of the document is pre-associated with a first voice model and a remaining portion of the document is not pre-associated with a voice model, with pre-associated and non-pre-associated text being displayed with different indicia to indicate the portions that pre-associated and non-pre-associated text; receive a user-based selection of text corresponding to at least part of the first portion of the document; apply, in response to the user-based selection of the at least part of the first portion a first set of indicia to the user-selected first portion the document; and overwrite the at least part of the pre-association of the first voice model, with a second, different voice model for the first portion.
13. A computer program product tangibly stored on a computer readable hardware storage device, the computer program product comprising instructions for causing a processor to: cause a user interface to display an electronic representation of a document, where a first portion of the document is pre-associated with a first voice model and a remaining portion of the document is not pre-associated with a voice model, with pre-associated and non-pre-associated text being displayed with different indicia to indicate the portions that pre-associated and non-pre-associated text; receive a user-based selection of text corresponding to at least part of the first portion of the document; apply, in response to the user-based selection of the at least part of the first portion a first set of indicia to the user-selected first portion the document; and overwrite the at least part of the pre-association of the first voice model, with a second, different voice model for the first portion. 15. The computer program product of claim 13 , wherein the computer program product further comprises instructions for causing the processor to: narrate words in the at least part of the first portion using the second voice model; and narrate words in the remaining first portion of the document using the first voice model.