Well, the vregs are intended to be 'all or nothing', but that's only in theory. In practice they have a drop off slope which is very steep. If you give them enough input, they output 5V (+/- a tiny bit) all the way, and then suddenly nothing, and the core switches off. At this point, the amount of power required to run the regulator drops (because your core is not doing anything) and it powers back up. MIOS studio will tell you that you have an unexpected upload request, rinse, repeat.... If you're really unusual, the power will be just enough, then you'll light a few leds, and it'll drop, and the core will BOR (Brown-Out Reset) and restart before it powers right off. BOR happens but not often (and much less often these days since a mod to the threshold a while back) If you're a total freak and have the luck of a one leafed clover (me), then it'll sit in the sweet spot inbetween working properly and a BOR, where it's not enough power to make it work cleanly and not low enough to cause a reset or a power off. In the history of midibox as far as I know, that's happened to two people, and I'm one of them. It's rare. So yeh I still think you were right the first time cimo. Pablop: you mentioned that which pots are too low, changes from time to time... is it a random spread, or are they groups of 'neighbouring' knobs?