So I have a rig set up and it seems to be doing great, Animation is very easy and I can "insert pose" for more animations. But I can't figure out how to modify the symbols that make up my character during animation.

Example. I Have a character in 3/4s perspective looking right. All symbols are on the same layer and the symbols are attached to eachother. In the middle of a 10 frame animation, I want him to look left with his head for two frames.

How exactly can I modify the symbol so that he looks left for two frames? Currently if I modify the symbol on a "pose" frame, it just flips the head for the entire file.