What I find very annoying is, that when you hit the volume buttons, sometimes you are changing the Ringer + Notifications volume, and sometimes the Media + Apps volume. When I'm in Whatsapp or Facebook messenger, I would expect, when I hit the volume buttons, it simply changes the Ringer + Notifications volume. But no, it changes the Media + Apps volume even thought there is nothing of media going on. On the home screen, and in apps like SMS and the dial app, it changes the Ringer + Notifications volume. In the calendar app it changes the Media + Apps volume for god knows what reason. I'm finding the way this is chosen all over the place very annoying! I remember in Android you always changed the Ringer + Notifications volume unless there was real media sound going on, when you would use the buttons then, it would change the Media + Apps volume. Much better and predictable. The way it is now in WP8.1 is very very irritating!