My reference to what Edison said and "nonsense" was more about how it's been interpreted by believers over the decades as I signified by the addition of the word "reportedly" in parenthesis. Of course, if you can actually develop a test that provides evidence that Edison was correct, I will no longer call it nonsense, until you do that, nonsense is the best word for it because what you claim contains no sense.
It's just the way you phrased your claim relying on something said nearly 100 years ago while at the same time making a multitude of claims that you can do what Edison suggested in the here and now. Your claim is really that you can do it and has nothing to do with Edison or his non existent machine. It is entirely to do with you and the equipment you use to do it today. Equipment and methods that can be tested as opposed to equipment that doesn't exist.
You mentioned it yes, you didn't say exactly what it was.
There are so many different types of recording devices, microphones, amplifiers and speakers all of which have their own characteristics both audiably and electronically.
For instance, here in the spare room which I use for a recording studio, I have half a dozen different types of microphone, two different mixing desks, I used to record onto three different types of media (until I sold the Fostex R8 tape machine), the signal goes through one of two amps (a domestic amp or a studio reference amp) and that signal is then redirected to three different types of speaker.
If I'm having a problem getting a sound I want or indeed getting rid of a frequency I don't want, it is essential to know exactly which route the signal is going so I can sort it out. If I need to speak to someone else about it, it is essential that they know exactly what equipment the signal is going through, otherwise they are simply stabbing in the dark.
This is why it is essential that you list the make and model of all the equipment you are using and describe in detail as clearly as possible the method you are using to get your results. If you don't do this, we are just stabbing in the dark.
Sorry, I'm trying to be as clear as possible. When I say you set equipment up, I'm asking you what equipment you use and to describe exactly how you use it. The simple act of pluging in a recording machine and switching it on and pointing a microphone is "setting equipment up". I'm not suggesting you had to "set it up" in some underhand or special way.
Edison was not working on such a device, or at the very least, there is absolutely no evidence that such a device ever existed. Bearing in mind the multitude of devices he successfully developed that our homes became filled with, the thousand plus detailed patents that he filed with detailed technical drawings and the files and files of his designs and ideas that are in existence, how or why would it only be this particular machine which was totally absent by evidence?
Why do you cling to this vague notion while ignoring the decades of scientific research backed up by verifiable evidence that shows a total lack of evidence for the existence of spirits?