The Kispest organ has a multi-purpose led display showing and helping the organist adaptively. Once you turn on the organ c00 is shown which corresponds to the Crescendo wheel’s 00 position with the crescendo wheel disabled. The reason that this is so is that this way you can go directly to the frame you need and engage the wheel at the position that you like directly. The number after letter c or C shows the actual crescendo frame.
Once you enable the crescendo wheel (by making sure that the Henger Ki button is not pressed) the display will show letter C (i.e. C00) instead of c00.