Only Front Page Content in RSS Feed???

I have a site that I've recently launched but I can not seem to figure out why the RSS feed at example.com/rss.xml only includes nodes that are on the front page. There is a blog at /blog and the feed for the blog at /blog/feed works fine, but when you create a new blog entry, it is not added to the site-wide RSS feed. There are image galleries, as well, and each image in the gallery, created using image module, is also created as its own node. These are not added to the feed either. I would simply like for every node created on the site, regardless of content type to get added to this site's feed. At the /very/ least I would like blog entries to be added to the site's feed. I mean, Pages are not even added to the feed. I can't seem to find a place to adjust what appears in the feed in the administration section of the site, I only see the ability to trim the feed to a certain number of posts and display teaser view text or the whole node.. that sort of thing.

How is this controlled? Furthermore, I should mention I am using the Syndicate block to display the RSS chicklet on pages in the right sidebar. It would seem like it would make sense to be able to tell the block to make that chicklet on each section of the site create a feed for that section. Like, the chicklet in the Syndicate block that appears on site.com/blog would be nice if it would point to that blog's own feed at site.com/blog/feed.. makes sense, right? I just can't figure out how to control this in any way.

help is appreciated!
-=- christopher