While producing an E-learning content or web based training, a major decision making factor is whether to use audio for the benefit of the end users.
Generally, narration is used for this kind of Audio E-learning. Music and sound effects are rarely used. This article describes the technical background for producing the best quality audio for this purpose.
Your voiceover or "voice artiste" can be your friend or foe. They can totally ruin your script - or they can turn your mediocre script into something vaguely acceptable. They can make your award-winning script into, well, an award-winning script - or not.