1. A method performed by a computer processor executing computer program instructions tangibly stored on a first computer-readable medium to perform a method comprising: (A) deriving, from a region of a document and a corresponding region of a spoken audio stream, a likelihood score representing a likelihood that the region of the document correctly represents content in the corresponding region of the spoken audio stream, and tangibly storing a representation of the likelihood score in a second computer-readable medium; (B) selecting a relevance score representing a measure of relevance of the region of the spoken audio stream, the measure of relevance representing a measure of importance that the region of the spoken audio stream be brought to the attention of a human proofreader, and tangibly storing a representation of the relevance score in a third computer-readable medium; and (C) deriving, by dividing the relevance score by the likelihood score, an emphasis factor for modifying emphasis placed on the region of the spoken audio stream when played back, and storing a representation of the emphasis factor in a fourth computer-readable medium.
11. The method of claim 1 , wherein (A) comprises: (A)(1) deriving the likelihood from a prior likelihood of correctness of the region of the document.