23. A system comprising: a memory; and a computing device configured to: process a first indicium of a plurality of indicia applied by a user over a first portion of words in a document; determine a first voice model to associate with the first portion of words, with the first voice model represented by the first indicium applied by the user over the first portion of words; and generate an audible output corresponding to the words in the first portion of words using the voice model associated with the first portion of words.
23. A system comprising: a memory; and a computing device configured to: process a first indicium of a plurality of indicia applied by a user over a first portion of words in a document; determine a first voice model to associate with the first portion of words, with the first voice model represented by the first indicium applied by the user over the first portion of words; and generate an audible output corresponding to the words in the first portion of words using the voice model associated with the first portion of words. 24. The system of claim 23 , wherein the computing device is further configured to: process 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; determine a second, different voice model to associate with the second portion of words based on the second indicia; and generate 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.