|»|2 Anonymous 2019-01-25T04:05:17 [ImgOps] [iqdb]
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It could work theoretically, but it sure sounds like a complicated thing to set up per file, and you wouldn't really be able to come up with something which sits well with every person. I think the ideal would be to have a series of standard "profile" names (e.g. "Calm", "Battle", "Sad") along with maybe a few more particular sound effect profiles ("Swords clanging", "Running", "Harsh wind"), and the reader can look at the metadata file to choose what sorts of sounds and playlists to choose from for each page. From there, you can add more advanced controls like fadeouts, speed, or volume adjustments.
A big issue in the way of a system like this is that you can't just pass these files around by theirselves and tell people to add them to their archives if they like. Some scans like to cut out the first white page, or put a credits page at the end of every chapter, or join every single fucking page and have this awkward huge wide gap inbetween the panels which you can tell wasn't actually there originally (fuck, I hate JJCAT), and the numbering index would just be thrown off entirely. I guess you could distribute versions especially for every group's scans, but even to a very dedicated group, something like that would get tiring fast. Plus, given that it'd just seem like an annoying gimmick to a significant amount of people, it just wouldn't be adopted.
One thing you've got to realise about the common comic book archive is that is has no metadata at all. I think some readers have the capability to display TL notes if it's attached in a file, but that's it. They're so severely limited that there isn't even any kind of metadata to say that any image is a part of a two-page span. What actually happens is that the reader checks the aspect ratio of the image, and if it's more wide than long, then it's treated as a "double page" which'll be used to override whatever number of images you're reading at the moment. As far as I can tell, it doesn't even check the filename. For a while I thought something like a reader that can "hot patch" a scanlation over a copy of a raw manga while you're reading could be nice, but something like that just isn't going to happen as long as people keep using Honeyview and fucking PDF readers for their comics.
Don't take it the wrong way, but doesn't the ordinary adventure game/visual novel already suit this criteria? Though I guess your idea is to improve comics that already exist, and not just start writing your own NGE fan VNs.