via this auction

indicator lamp, and custom mahogany end cheeks.
Its in great condition considering its 35 years old. Everything works, all keys sound, all inputs work, has CV & S-trigger inputs (Yamaha call it HZ/v) for
linking with other old synths or to use with a Midi to CV converter.
Few minor things, there is two small marks on the end of one key as pictured, and a couple of the pots have a slight crackle, but that's common in gear of this age."