Yup,
Searched both the Korg and KarmaLabs forums. I use to hang out there alot.
Not very many issues that I could find. Usually, the user would load a PCG file that could re-write the global info which included that half pedal calibration file in the oasys. Another instance where a capacitor in the key matrix had died and was causing the issue. (don't want to go there...)
I did find out that it does use an ALP's potentiometer to allow for the differing values of CC#64 but I don't know what the range of the pot is suppose to be. I do get some varying resistance values while the pedal is at full pedal depression so not sure if that could be the cause.
I did see a funny little thing from one of the Korg product development guys that said he actually used the Yamaha pedal instead of korgs and how to change the polarity info in the global file.
I will shoot Korg another call Friday to see if they can at least provide tech info on the pedal but they usually get tight lipped when you start asking questions regarding electrical components and specs. They don't publish them online...