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. 10. The method of claim 2 , further comprising: modifying 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.