Owner of KR-1070 - Looking to expand its functionality by replacing boards, drive to include usb and/or bluetooth, expanded system memory, and peripherals for direct usb midi to computer interface. The hope is to upgrade to level of most recent pianos on the market. If you can advise on compatibles, please reply. Thanks. 
I rearrange music using flat notation software and others that allow playing on a midi piano keyboard to interface directly with notation software through usb midi to computer interface. Real-time piano keystrokes are displayed on staff lines in the software using record mode. Editing is so easy and can playback through the midi device using onboard sampling.