User blog comment:NeonSpotlight/I am NeonSpotlight, ask me anything :3/@comment-3250799-20140227014741/@comment-3308937-20140227020826

I have no idea how sound files work but I'd assume every file would have to adjusted and re-uploaded.

If there were a possible way it would probably use javascript and that wouldn't change the file being loud itself, just change the volume of them on the specific pages they're on.