This Keyboard is some 25 years old, and remains in good working order. The power supply ( supplied ) powers a rebuilt power assembly within the keyboard. The MIDI IN and THRU functions are ok, however due to an internal fault MIDI OUT DOES NOT WORK. All pre installed Sounds and effects work ok. All audio outputs are working fine. The Keyboard Keys unfortunatley are stained with age as most early Korg X50's appear to do.