Voice-overs: start automatically or when user clicked?
I have built a course with texts, voice-overs and video's. The video's will start when the user clicks the play button. The voice-over supports the text, so that the learner will receive the information both visually and auditory. To support the text in an optimal way, I think the voice-overs should stream coincidently with reading the text. Should I use a button to trigger voice-overs, or is it better to start the voice-overs automatically when te timeline starts? How do you think about this?