We have a CTK-5000. I discovered it is two semi-tones off. For example, playing a B key gives a C with multiple different tuning sources. I can put it back in tune with the Function/Transpose, but resets to the original when the instrument is powered off. Any ideas how to change the default tuning? Note that the transpose function only works for that particular tone; changing to a different "instrument" sound results in the new tone being out of tune unless we change it. I know there are ways to save settings such as Registration Memory, but I am looking for a more permanent, across-the-board solution.