Comfort perception of the information. I have once said that reading the text – it is a stressful occupation, to the eye and the brain. It's a long process of concentration! Therefore, listen to information, certainly more comfortable, and usvaevaemost material is much higher, because the hearing did not need a focus and tension of the mind. If you ask anyone how way he would prefer to receive training: just listening to a lecture or reading it, I'm sure 80% will choose the plays, high credibility, which is achieved at the expense of emotion and easily transferable argumentation the author's voice. Despite the fact that copywriting (science writing advertising texts) came up with a bunch of ways to convey the emotional component, but it is not in what can not be compared with how to convey the emotional live voice. Often one notes enough to pass something that does not do any text with all its possibilities; enough low amount of information. Due to good compression of sound files which is achieved today through a new MP3, size and quality audio for the Internet is perfectly acceptable, even for poor Internet connections.
In addition, flash technology enables both play a part audio messages, and immersed in the buffer the next segment file. That is, you do not have to wait until load another piece of writing to him and then listen. This happens odnovemenno!; Easily create audio messages and Flash-Buttons. Again, if we consider the record, the preparation and installation of video recording and editing audio, the complexity of the process entirely different.