I watched the plane video. It's quite a good demo, but I will never ever ever sharpen my planes that sharp. I will also not be jointing my gunstocks. I am roughing it, man. Ruff-ruff! Chew that wood off.
Well are lots of videos pasted in this thread. If you're speaking of Mr. Sellers and the
Plane Cam video, I don't recall the specifics on how he sharpened that lot, but he does have a video showing how a
250-grit stone (yes only the one zero) cuts great curls and leaves a good finish. My "coarse" DMT diamond plate (for flattening of waterstones) is 325 and plenty good for hogging off a bevel that produces feathery wisps o' wood.
So it don't take much to make a plane sing, heck i do it free hand (no rolley jig). If i want to get fancy i'll use my razor "bevel setter" and kitchen knife stone of 1000. Above that is reserved for razors proper.