Rhodes Chroma Polaris

I decided to take a chance on a membrane-dead Polaris. So do you have
to access the controls (other than the keyboard itself) thru a
computer? What about a smaller MIDI controller (for instance - those
hand held MIDI things I've seen around)? I've played 'boards for
several years now, but have not needed to mess with MIDI before now.
Any advice is appreciated.