Hi Hans,
please refer to the pages 129, 132 and 133 of the SX900 Reference Manual. On page 133 is described how save or load the three different Setup Files
System (.
ssu),
MIDI (.
msu) and
User Effect (.
eff) individually.
>>>
https://uk.yamaha.com/en/products/musical_instruments/keyboards/arranger_workstations/psr-sx900/downloads.html#product-tabsP.S.
The User System settings, User MIDI settings and User Effect settings are also saved in the .
bup file using the Backup function (page 132). But note that such a .bup Backup file also includes the whole content of the User drive, and when you restore a .bup file, all mentioned User settings and also the User drive are overwritten.)
P.P.S.
The Master EQ settings can only be saved in one of the 30 User memories (USER1 - USER30) in the Master EQ display. The Master EQ settings cannot be memorized to Registrations. But the Master EQ settings can be changed by MIDI files that contain Master EQ SysEx (and also by a Registration that calls up such a MIDI file). Therefore, I strongly recommend to have
ticked "
Master EQ" in the "
Parameter Lock" display (page 130 of the SX900 Reference Manual). The Master EQ settings then can only be changed manually in the Master EQ display, but not accidentally by calling up a MIDI file.
P.P.P.S.
Directly on the keyboard you cannot save the Master EQ settings into a MIDI file. But with a MIDI Sequencer program (DAW) or very easily with the "Midifile Optimizer" on the computer this can be done. (And those MIDI files can accidentally overwrite your Master EQ settings when not locked in "Parameter Lock".)
Best regards,
Chris