1. A computer implemented method, comprising: receiving by a computer a user-based selection of a first portion of words in a document, at least a portion of the document being displayed on a user interface on a display device, the document being pre-associated with a first voice model; applying, by the computer, in response to the user-based selection of the first portion of words, a first set of indicia to the user-selected first portion of words in the document; and overwriting, by the computer, the pre-association of the first voice model with a second, different voice model for the first portion of words.
4. The method of claim 1 , wherein the words in the first portion of words are narrated using the second voice model and remaining words in the document are narrated using the first voice model.