I understand why Terry would think much of this advice is spurious, but I offer it as steps in understanding the types of things people can do as tricks, which will hopefully help further them in their grasp of using the tools that pros use, even if they are chaper versions of them.
It allows them to spec things that they might want to spec, and at least start with a bit of knowledge. Although they say a bit of knowledge is dangerous, it is also how we get started.
"Widening effect" is just Stereo imaging, and a trick that I will happily admit should be left to pros in a perfect world, but for folks to understand how a lot of hip-hop mixes take advantage of this type of thing, they kind of have to try it for themselves.
Sorry if it seems I am arming the kids with shotguns, but the smart ones won't shoot themselves, and the rest is just culling the herd.