It’s going to follow the position of whatever it’s linked to. I’m sure someone smarter could think of a way to delay that, but if I wanted to do what you’re talking about, I’d animate the pencil, then copy the position keyframes to the Write-On effect brush position. You’ll probably have to line it up with the pencil tip or where you want it, then offset the keyframes enough so that it starts after the pencil. You may have to delete some of the keyframes so that the Write-On effect isn’t drawing them where you don’t want them.
That’s a very manual way around it. I recently bought Speed Lines on AEscripts which does what you want here with so much more control.
Jason Jantzen
vimeo.com/jasonj