There is no calibration reset... there is a calibration data erase function in the service mode... for some reason when this is erased first, the calibration routine in the global menu runs faster... especially if I have my REV2 warmed up when i do it... but i got a completely wonky calibration yesterday when i did this... for some reason a power cycling is needed in my case...
I also realized, that if i powercycle quickly (less than 1sek), then the display still has lots of the details it had before power cycling, but this also result in a slower calibration afterwards... if i powercycle, but wait 20sec before turning it on again, then the display show "noise", and the calibration goes a lot faster thru...
I'm not sure what is happening, but I'm speculating about this issue being because of either some capacitors that may interfere with the calibration, or maybe it has to do with what sound you had as the current program when you initialize the calibration...
I also noticed that the first voices that it calibrates goes a lot faster then the voices following them... it's like it slow down over the course of the calibration...
I've not gotten any info from support on this yet, except a first reply that did not give me any answers or solved anything... but I'll let you know if/when I know more...