Sound to me like you lost your memory due to a dead backup battery and now you need to dump the sounds back into it. From reading on the net i saw that the same thing happens if a DW-8000´s battery dies. I think that many old synths don´t have a "factory restore" ROM so if the battery dies in new synths the original factory presets are there even without a battery while in old synths there will de nothing until you load the sounds again. Seems logic since ROM memory was very expensive (an small) back then. Fun to think about when memory is so cheap now
