A while back some people suggested I post a video of the foot-joint that allows the playing of C below the bottom D to better illustrate how it works. Here are two for those interested. They are a bit rough (I’m not a seasoned player of the pipes). I hope to have some better ones down the road.
http://www.youtube.com/watch?v=roxhNkZMB3c
http://www.youtube.com/watch?v=voU-IHpU5us