Media Product. How Does Audio help it reach an audence and convey meaning?

Here is Welcome To Nightvale - Episode 1 Pilot

Welcome To Nightvale is a story about a small desert town, and the strange happenings around and inside Nightvale. We hear the story from the radio station, as the presenter tells the news. This is an audio-show and completely rely's on audio. It uses music and sound effects as well as voice to tell it's story. The writing that is descriptive is really good at putting images into the minds of the audience. Music is used to add atmosphere such as fear, or trepidation.  Sound affects also help engross the audience and implant images into the minds of listeners. Voice is very important. Using tone and emotion you can get so much out of a sentence. When the presenter says "Carlos" he says it long and clearly, so we know it's important to remember and to listen.

However this although is a good show it does lack some things. Almost anybody can listen, unless they are deaf. People who may be hard of hearing could possibly use subtitles which are available on youtube, or if this was a live action show, they could lipread along with hearing, however personally this removes the mystery of the show. And if people find it hard to understand emotion, they may get less out of the show since the reliance of the voice, however they may get an equally big kick from the rest of the show.

I was thinking of choosing that 3rd option of a news report/documentary-esq kinda thing. I wanted to have that playful twist like this show has. Now this show has a massive fanbase that are loyal and follow each episode. My show will not do the same, but this shows how the medium can work. I was thinking of a documentary about pursuing some mythical creature. Of course the footage I will be using will be stock footage because footage of the creature has never been seen. The presenter will try convince people this creature exists through the 2 min show. Perhaps the creature attacks him in his studio tracing the radio wave, or perhaps he is silenced by some faceless organisation and replaced by a please standby message. Whatever the case, it could be quite good.