Actually there is no reset for the POLY-800 . If the memory battery has died or all the programs overwritten with other sounds , you must have the original program tape to restore the factory sounds . Korg may still have some , some authorized Korg repair places might have a tape that they keep for repairs and battery replacement . Otherwise you will have to search the internet . Goodluck , it shouldn't be too hard though , Korg sold over 100,000 POLY-800s .