New for version 4.6 and beyond: Swipe left-right will now advance the slide without advancing the audio. A single tap will resynchronize by jumping to the current audio location. The next\prev icons work as before. This allows you to take a “peek” at previous or upcoming slides while continuing listening to the audio without interruption.
LectureMonkey synchronizes playback between the slides and the audio. As you watch the lecture, the audio and slides will advance in unison. If you want to skip to the next (or previous) slide during playback you can use the standard iPhone left-right swipe gesture, or use the next\prev slide icons: