Bill Morgan says he doesn't know how it works. He thinks the sound just goes to the ear of the person and acts as a reference. I don't know. I get what I call a "hearing blink" when I cross the signal line. The sound seems to go dead for an instant, like those sound cancelling headphones. Morgan says you can hear a difference in the sound and it's possible some sound meter might be able to detect this unless it really is all in your mind. I've looked into some meters but the only one I think will work (goes down to 0.1 hz) costs $200. I found some software for $50 but haven't got motivated enough to buy it and see if it will do anything.
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