As part of my daily pedal hunting, I came across the nice gentlemen from Lotus Pedals Minnesota. They have a distortion pedal called the THD+N (http://www.lotuspedaldesigns.com/products/thd-n). While the demo video sounds very nice, but I am confused by the readings they are showing and the following description: "Short for Total Harmonic Distortion + Noise. The THD+N is a Lo-Fi Fuzz with Harmonic Distortion measurement is excess of 80% which are sweepable between even order and odd order harmonic distortion." What do the readings mean, and what does the even/odd order mean? I'm just curious how this is different from standard distortion pedals. Thanks!