I have searched and found a lot of people asking about how to add a custom rss feed for custom post types/taxonomies. However that's not the problem right now.
I have 2 extra pages on my site that looks like the default index page (with loop and stuff), the only difference is that they have a different orderby. And I want a feed for those pages too. Putting /feed behind those pages returns a Comments feed with no items. How come? The code of those pages are almost identical to index.php and the feed link works fine there.
I understand there's a add_feed function. But I don't want a new feed type, just the default one is fine.