How do you distinguish robotic voices from normal human voices in comics?
Sometimes, in comics, you have a robotic voices coming out of a machine saying something like "Download Complete!". I am wondering how to tell the readers that these voice prompts don't come from a human being or other characters, but are generic voices coming from a machine giving a vocal prompt to the user.
I am guessing there are many ways to handle this, but what's the best way?
I found this, but this way of doing things is not different from someone shouting, so I was looking for a way of showing the dialogue that would not be confused with someone simply shouting. Not sure if that exists, a dialogue bubble or some visual cue that's uniquely associated with a robotic voice.