Hello, Just joined the forum as a happy owner of a PX-350. I'd like to clarify that you have to turn Setting Backup from Off to On (or On, Off, On) each time you want to store settings. Leaving it on does not automatically backup any settings you happen to have at the time when powering off the keyboard. However the action of toggling from Off to On does. Hope this helps anyone else who was initially confused like me Richard.