The standard post format is built how it should be. First the post type will see if you set a featured image, if so it will display that, if no featured image is set it will simply show your title, meta and content. The text displayed on this index page, and also on the front home page, will stop wherever you place the read more tag in your post. Again, total control the way it should be.
The gallery post format is built in a special way based off feedback from buyers. First the post type will see if you set a featured image, if so it will display that, next if no featured image is set it will check if you have images attached to your post, if yes then it will automatically display a touch enabled and responsive slider to beautifully display your images.
“I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.”
Example of a Audio Post Type in WordPress – now with WordPress 3.9 playlist feature, it’s even easier then before.