Does Apple Pencil work only with certain apps
I've just upgraded to iPad Prop and have bought the Apple Pencil.
The video of how the Apple Pencil uses force and tilt to create thicker and thinner lines and shadow really impressed me. However, since I bought it, I've tried it on a few different notes apps (Evernote, Penultimate, Good Notes etc) and haven't been able to get it to work in the way that appears in the video. Its lack of atency and its touch are magnificent, but I seem to be able to get it to write only with a standard thickness.
Does it work only with certain apps that have been developed/upgraded for use with an Apple Pencil, or is it just that my technique needs work?