Everything was in User, consisting of 75 song styles 30 CDG audio(not checked), and 50 SMF registrations.
Storage shows correct USB used/available, but USER shows full 4 gb available, so appears empty, as it appears in the main window.
I must have deleted User by mistake, and the ,bup must be devoid of song data. I remember the
usual warning when I formatted a USB stick to use for b'up, but there could have been another I should have heeded.
Thank you for your help, but I guess I will have reconstruct, as you say 478KB is not enough to represent my registrations. I have my pa4X in the wings, so I wil do the gig with it.