19. A computer-implemented method for modifying current narration audio data created by recording words narrated from a transcript text, the computer-implemented method comprising: as implemented by one or more computing devices configured with specific executable instructions, retrieving an audio data file comprising the current narration audio data; generating a notification to a user indicating a portion of the transcript text to be re-recorded, said portion comprising one or more words of the transcript text; receiving replacement narration audio data created by the user, the replacement narration audio data corresponding to the portion of the transcript text to be re-recorded and comprising the one or more words of the portion as narrated by the user; and based at least in part on alignment of the one or more words of the transcript text with corresponding audio data of the audio data file, replacing one or more words of the current narration audio data within the audio data file with the one or more words of the replacement narration audio data, such that the audio data file comprises (a) at least a portion of the current narration audio data before the one or more words, (b) the replacement narration audio data corresponding to the one or more words, and (c) at least a portion of the current narration audio data after the one or more words.
19. A computer-implemented method for modifying current narration audio data created by recording words narrated from a transcript text, the computer-implemented method comprising: as implemented by one or more computing devices configured with specific executable instructions, retrieving an audio data file comprising the current narration audio data; generating a notification to a user indicating a portion of the transcript text to be re-recorded, said portion comprising one or more words of the transcript text; receiving replacement narration audio data created by the user, the replacement narration audio data corresponding to the portion of the transcript text to be re-recorded and comprising the one or more words of the portion as narrated by the user; and based at least in part on alignment of the one or more words of the transcript text with corresponding audio data of the audio data file, replacing one or more words of the current narration audio data within the audio data file with the one or more words of the replacement narration audio data, such that the audio data file comprises (a) at least a portion of the current narration audio data before the one or more words, (b) the replacement narration audio data corresponding to the one or more words, and (c) at least a portion of the current narration audio data after the one or more words. 25. The computer-implemented method of claim 19 , wherein said replacing one or more words of the current narration audio data comprises automatically replacing each instance in the current narration audio data corresponding to the one or more words with the replacement narration audio data.