Korg Poly 800 Mk1 for sale. Fully tested, cleaned and serviced by professionals and working great. This model normally has its memory backed up by standard batteries, but they tend to leak and cause serious damage. Even when they don't leak, they often die and take your patches with them! We had our tech wire in a much longer lasting memory backup battery to save you from the hassle of dealing with frequently dying batteries and the resulting memory loss. If you're looking for a P800, this one should make you very happy!