Some features :
Picture taken from here
Product : Keyboard Computer
Manufacturer : RMI
Release date : 1974-1975
Country : USA
61 keys polyphonic synthesizers.
Presets section : Bass / Ensemble / Solo.
Extra voice can be used with expansion card (maybe 28 cards exist).
Pitch bend controlled by pedal.
Adjustable sustain lenght.
Three independant audio chanels.
One of the first digital synthesizer.
JM Jarre has the first model which is ultra-rare.