Thanks for you feedback, I have been on beck for last 2 months now and I can say it works for my problems with yeast overrun, food allergies , energy and better sleep.
I eat foods that I was not able to for long time :)
The idea of taking zappers positive offset with frequency to Beck's auto-reversal, I think will rock the comfort of any bug.
Thanks for the link, that is rather advance device for me to build.