I have a Yamaha TX802 that I'm getting along pretty well with, but theres one problem. It dosent save when i turn it off. Even it's still plugged in it seems to reset every time i turn it off. Could it be a battery or something for the memory thats out or is the memory just broken? All the presets are still there but the stuff i save disapears. I'm guessing I could get a cartridge and save everything to that but would like to know if I have any chance of fixing the problem as well.