18. The computer-implemented method of claim 17 , wherein determining the length of time required to output audio content corresponding to the determined segment of textual content includes determining a length of time based at least in part on the stored synchronization information.
17. The computer-implemented method of claim 9 further comprising: generating synchronization information based at least in part on the synchronization between the output pointer of the textual content and the associated position of the generated audio content; and storing the synchronization information.