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Something I was going to share was during one "spirit investigation", not from the link I gave but another group, contacted the spirit of a child. The child would communicate by spinning a pendulum pointing to letters - then it stopped. The EVP playback had the spirit voice of the girl saying she didn't tell his name and the other more aggressive male asking her this 2 or 3 times. If she told them his name maybe through it he would loose hold over her, he definately sounded concerned.
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This sort of thing also fascinates me!
But what I want to know FIRST ... is how do those machines (EVPs and things) precisely work. Exactly what inputs get mapped to the voices they output? Call me a skeptic ... but I would like to know a bit about the technical end of things before thinking too much more about it. It sure is amazing, dramatic and exciting, though!

The idea that we exist in a world filled with spirits that have natures different than human and even spirits of ancestors passed is neither new nor unusual. It seems to be a fairly common theme throughout history and mythology across nationalities and ethnicities. So I wouldn't be all that surprised if we were to find some truth in it.
This kind of thing could potentially change a lot about the way scientific and modern society relate to the world around them. But it does depend a lot on what exactly is going on with that technology.

I tend to think that certain houses point to particular dimensions that a person might naturally associate with closely or tend towards.
I think that certain planets might give clues as to the methods of crossing (communication, dreams, signs, encounters, past lives phenomenon, out of body experiences).
I think that certain planetary configurations might also point to unique methods of crossing over that also incorporate the corresponding houses of those planets.

As for the spirits of the dead walking the earth and trying to contact the living - I would tend to ask which part of the person precisely remains and which part moves on. I would tend to ask - but might not actually ask simply because I'm not sure I would really understand. There is a lot that we don't understand when we tread this ground. I think we have to especially be aware of how easily spirits could trick us in this case. One type of spirit (assuming they exist) could very well attempt to pass itself for another. How would we tell?

In the case of exploring the possibility that other dimensions coincide with our own on some level (across what type of boundary I could not tell you) - I would also question the purpose of such crossings ... to what benefit are they? In what way do the paths really cross in a practical or meaningful sense? It just seems to me that as curious as I might sometimes be about it - the risk is high relative to the potential benefit. So even if I might wonder and even theorize - I tend to "pull back" from it all in a way.