the simplest way to keep a preferred overall equalizer setting is to store it in custom panel and press that button after switch on. The default expand panel memory filter for equalizer is OFF, so changing panel memories will not change the overall equalizer even if different settings are stored in those panel memories. Then if you go to Customise, Data Protection, Total Equalizser, set to ON and OK, loading a file with a different equalizer setting will be prevented from changing your preferred setting.