Tradition has it that we line up the fence to the blade to get a parallel cut, but lining up to a static blade can in fact set the fence un-parallel to the actual cut.
If you have done a dynamic line-up of the blade to the miter slot in the last video, you can now line up any setting of the fence to the miter slot. Doing so you are setting the fence parallel over a three foot distance and not just measured to a 10" blade -- and you are lining it up to the dynamic cut of the blade as well.
It is all simpler on video -- take a look.
Learning Curve 96