Can any of you good folks tell me where I can get an AC adapter for my PX3B? I don't leave anything plugged into it when it's not in use and I use the illuminated screen sparingly, yet, it seems to have an appetite for batteries. All the PXB3 vendors I've contacted, including Korg, either don't respond or act like, "Adapter? Whazzat?" (And I thought just using the thing was an enigma). Thanks in advance!