I feel your pain! I have one too and it is one finicky pedal. Recently, the "Low/Mid" knob will only work from 7 o'clock to 12 o'clock.
Just a suggestion for the Korg. I once before had it crap out on me really bad, and I took it completely apart. Took the circuit boards out, unplugged things, blew on it. Just gave it a general airing out. It was either that or bring it to a repair shop which I wasn't going to do. But it seemed to fix the problem. Worth a shot.
I have no idea what other pedal might sound like it though, sorry.