Hi Ray,
pressing and holding the top white key while switching on triggers a System Reset. This restores the System Setup parameters to the original factory settings. Refer to "Parameter Chart" in the CVP-809 Data List for details about which parameters belong to the System Setup. You will lose your user-defined system settings and you will have to reset everything that you have changed so far.
This System Reset method does the same as a Factory Reset under "Menu > Utility > System > Factory Reset / Backup > Page 1/2", if only a checkmark is set for "System".
A System Reset does NOT delete any user files like Styles, Registration files etc. (in the User drive or on a USB flash drive).
In principle, however, a System Reset should
only be carried out in the event of an
error (e.g. if the keyboard has "hung up" and no longer works properly after a restart).
Otherwise, just go through the various menus and set all functions as
you wish.
Best regards,
Chris