Bah!
a) "unnatural variations." The entire grid is a manufactured and hence unnatural artifact.
2) Riiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiight.
$) It occurs to me that many device I've owned have introduced low-frequency ringing on the line. Foxing this technique would seem to be trivial in a post vacuum-tube technology base.
Biting the hand that feeds IT
