I use an app called Speed-Up for audio books that are mp3 format. Overdrive is offerring audio books in MP3 and also if I rip from a DVD I can put the mp3s via I-tune software right into my IPhone. It allows speed control ( I almost always advance playback speed to 1.25 or more for Brittish narrators), finger swipes to go forward or backwards 30 -60-90 seconds or pause. It also has a nice scrubber and I believe, sleep timer. Also it's free.
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