I've thought about that also, what I come to realize using radionics over the past 25 years and hey I might be spit balling here, the machines I had and others out there no matter how simple the device I was always noticing the opposite...I can use just about any radionics boxes out there, I learned from using H. Machine that H called "Eloptical" energy (Scalar). This is a given for all people, no matter the device, H. stated you have to be gifted to use them. He couldn't use them but he built them and his wife used it only! He made mentioned of this several times in his day. I agreed, my wife couldn't use my so called elaborate machines which included the HDR, but I could. It's got to be in the genetics most likely, someone in the family tree much further back, who used their gift one time or another. This was problematic with the HDR, some people like us were gifted and experienced time traveling, while others were hoping the machine would do all the work. It's a tentative though with my opinion, when I see others, who can use the HDR just like the HDRkid (Carl Novella) or Gibbs himself.