Francis just an update on my video regards aperture corners. Been reviewing all the posts and Gregs video on how pitch changes. My video could mislead you a little. Greg states that aperture corner tension changes pitch. This tension or firming of the aperture corners makes the corners move inwards to change pitch. My video implies its the movement of the muscles horizontally that achieves this movement. This is not quite true. Its the firming of the aperture corners combined with horizontal muscle movement which makes the corners move inwards. In my video I never mentioned firming up the aperture corners. This is I think the key. This is really hard to explain but have another review of Gregs video “Understand Shape to get better results” that John posted. Sorry for any confusion.