2. The method of claim 1 , further comprising: processing, by the one or more computers, a second indicium in the document to determine a second portion of words in the document, the second portion of words being different from the first portion of words; determining, by the one or more computers, a second, different voice model to associate with the second portion of words based on the second indicia; and generating, by the one or more computers, an audible output corresponding to the words in the second portion of words using the second, different voice model associated with the second portion of words.
2. The method of claim 1 , further comprising: processing, by the one or more computers, a second indicium in the document to determine a second portion of words in the document, the second portion of words being different from the first portion of words; determining, by the one or more computers, a second, different voice model to associate with the second portion of words based on the second indicia; and generating, by the one or more computers, an audible output corresponding to the words in the second portion of words using the second, different voice model associated with the second portion of words. 3. The method of claim 2 , wherein the first indicium comprises a highlight applied over the first portion of words and the second indicium comprises text-based tags associated with lines in the document.