Scrolling Timeline During Preview
When previewing a video, the timeline only resyncs at the beginning of each scene. That means that if the scene runs long enough, then you cannot tell where in the soundtrack you are as the video is playing. This makes it harder to adjust the timing to make the voiceover and the drawing sync up. It would work better if the timeline scrolled as the audio was playing so that you could always see where on the timeline you are.