While I still don't see a way to navigate by character or word, they apparently do see the need to navigate by sentences with this program. And a book that has its speech disabled if read on the Kindle will read using the computer ap. The sample of a speech disabled book worked any way. When time permits, I'll buy the full book and see if the computer ap will read it like it read the sample. If so, that will be a big positive step forward for me. Randy Black