Hi Oz,
on Genos you can NOT save changes made to a MIDI file in normal PLAY Mode. This is different to Tyros- and PSR-S models.
You have to do the following steps:
1. Press [RECORDING] ---> MIDI Multi Recording
2. Load the desired MIDI file
3. Make your changes (e. g. in Score window)
4. Press "Exit" (or touch "X") to come back to the "MIDI Multi Recording" window
5. Touch "Setup" to call up the Setup window
6. Be sure that you have ticked the UPPER SEVEN checkboxes (Voice to EQ)
7. In THIS case, additionally tick "Score Setting" box
8. Touch "Execute" and "Close"
9. Touch "Save" in "MIDI Multi Recording" window to save your file. (I recommend changing the file name to avoid overwriting the original file.)
P.S.
Do NOT tick "Keyboard Voice" box in Setup window. Otherwise your Keyboard Voice settings (Parts R1 - R3 and Left) would be written to the MIDI file, and you could not work with Registrations anymore, in conjunction with this MIDI file.
Hope this helps!
Best regards,
Chris