26. The system of claim 21 , wherein the computing device is further configured to: modify one or both of the first and second voice models by at least one of modifying a reading speed associated with the voice model, modifying a volume associated with the voice model, modifying the gender of the character associated with the voice model, modifying the age of the character and modifying a language of the voice model.
21. A system comprising: a memory; and a computing device configured to: load an electronic representation of a document; receive a user-based selection of a first portion of words in the document, at least of portion of the document being displayed in a user interface on a display device, the document being pre-associated with a first voice model; apply, 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 overwrite the pre-association of the first voice model, by the one or more computers, with a second, different voice model for the first portion of words.