RMI Keyboard Computer

Picture taken from here
Product : Keyboard Computer
Manufacturer : RMI
Release date : 1974-1975
Country : USA

Some features :
61 keys polyphonic synthesizers.
Presets section : Bass / Ensemble / Solo.
Extra voice can be used with expansion card (maybe 28 cards exist).
Transpose mode.
Pitch bend controlled by pedal.
Adjustable sustain lenght.
Variable vibrato.
Three independant audio chanels.

Comments :
One of the first digital synthesizer.
JM Jarre has the first model which is ultra-rare.