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This is generally inadvisable (which is not to say that it is not done sometimes). The reason it is inadvisable is that every artform has its palette, its set of devices and conventions by which it...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/27559 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27559 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
This is generally inadvisable (which is not to say that it is not done sometimes). The reason it is inadvisable is that every artform has its palette, its set of devices and conventions by which it tells its story. Mastering any art form is about learning how to tell the story within the confines of that palette. One of the limits of the prose palette is that is does not support sound effects. You can describe sounds with words, but you cannot reproduce them. One of the limits of the movie palette is that you cannot describe sounds, you can only make them. This means that all sounds in a movie are presented literally, and that it is impractical to present sounds that are injurious or painful to humans. (Movies have to fake this by using non-painful sounds and having the actors writhe dramatically -- something every third Star Trek episode seemed to indulge in.) Prose, by contrast can describe sound by metaphor, suggesting a far richer experience than a mere speaker can produce. So, you treat sound differently in prose and on video. What you are proposing is to represent sound through a font change. This is not part of the common palette of prose, so reader will not know what to make of it. This will tend to pull them out of the story world to ponder the meaning of your typography. But more importantly, there are other, richer, and more conventional ways to handle this in prose. You can describe the nature of the sound the first time it is heard, but if you really want to make a voice distinctive in prose, your best tools are distinct diction and distinct message (what is said, and the words chosen). Don't try to extend the palette of prose; try to become a master of the whole of the existing palette. It is more than adequate for any story you might wish to tell.