Glenn's ?

Does sound offer a persuasive argument alone or does it need to be associated with another type of media?

I think sound is by far enough all that is needed to make a persuasive argument. The radio and online blogs with sound prove that. Before there was TV, the radio was the main source of media for Americans and their families. Obviously, the radio and just its sound (however various types of sounds were and needed to be used) was enough for many years for world leaders, entertainers, and everyday people to get their points across. I do feel that a more inclusive media, such as the T.V. or internet (if sound and video are present) are medias that are able to make the audience feel more as if they are part of what is being argued. However, sound alone is enough to persuade an audience even if its use as an enhancement works better.