Huh, interesting; no clear consensus. The reason I ask is because I have a keyboard with horizontally-arranged volume buttons that are in the left-down, right-up configuration and I often get them confused. So it doesn't seem like I'm alone in the idea that it's not intuitive--but I don't think the other way is either.
I think the logic is that this arrangement corresponds to other horizontal volume sliders in media players and the like where the louder end of the slider is to the right.
@SimonTesla if I had to guess I'd say that this probably derives from the left-to-right reading of many languages, so it makes sense for a horizontal volume bar to "start" (0%) on the left
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