1. A computer implemented method, comprising: displaying by a computing device on a user interface an electronic representation of a document stored by the computing device 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; receiving by the computing device a user-based selection of text corresponding to at least part of the first portion of the document displayed on the user interface; applying, by the computing device, 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 of the document; and overwriting the at least part of the pre-association of the first voice model, by the computing device, with a second, different voice model for the user based selection of at the least part of the first portion.