I set up 8 registrations (right hand voices) for my friend and it worked for years. He became ill and didn't use the 1000 for over a year. When he went back to it the registration voices were gone. He brought it to me to put them back in and it will work until you turn it off. When you power back up they are gone. For most of us this wouldn't be a problem but for my friend who is 80 and in poor health it is a big problem. I believe there is a battery or capacitor that keeps the memory when turned off.