Hi dqninh,
just change the filename somewhat (or type in a completely new filename) during the "Save" process. By doing this, your current Registration Memory setting will be saved as a NEW Bank file (with the new file name), while the previously selected Reg Bank will simply be closed (and left on its original state).
So, you never will need an "empty" Reg Bank: Just memorize the desired Panel settings to one or several Reg buttons (1 - 8 ) using the Memory button. Then press "Save" and, as mentioned, type in a new filename to creAte a new Bank with your current settings.
If you do NOT want to create a NEW Bank, but just save the current Bank again, e.g. after changing some settings or adding/deleting Registstions (buttons 1 - 8 ), then do NOT type in a new filename, but simply confirm the message to OVERWRITE the current Bank.
By the way: To completely DELETE some Registrations (so that the Reg button in question no longer lit) use the "Registration Edit" display.
In this way, you can also create an EMPTY Reg Bank, if desired. But my suggestion is NOT to start from an completely empty Bank. Just start from any other of your existing Banks.
Best regards,
Chris