There is no talk of oscillating pressure mixed with oscillating voltage .
Only a vaguely explained ''gravity'' thing .
Here is a nice video , as well
I was happy when I saw they tested this ith an 'hydrophone' , as I have one of these . I will make a video showing how you can see 'physical vibrations' happening in water on an oscilloscope screen .
No annoying programs to use , plug and play .