Vintage Roland GR 500 Guitar Synth System

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"Vintage Origional Roland GR 500 Synth System, 1977/1978 one of the first guitar synths, if not the first, this auction includes:

GR 500 floor or tabletop synth module, 'les paul' style guitar controller ( very heavy) in Origional guitar case, and Origional Roland multi pin connector ( multi cable connects guitar to synth module, only output is from synth module, can not be used as a stand alone guitar)

Guitar switches and pots do turn off and on, and vary the LED/ level of the : Guitar - Polyensanble - Bass -Solo Melody - and EXT Synth sections.

The guitar output functions fine, I'm not sure if synth sections are workin, the multi pin cable functions or there would be no guitar sound. I do not have the skills to understand if synth sections/ tracking is working, the units power up and indicator lights work accurately - but I CAN NOT PROMISE that the synth sections are currently working SOLD AS IS. It is probable this unit needs servicing, but having said that: the GR-500 is a very rare bird.

The synth module is in very very good cosmetic shape ( 1977/1978)
The multi cable is good (1977/1978)
The hard shell guitar case is fine (1977/1978)
The guitar ( controller) looks almost new, looks beautiful ( just missing one small nut from one toggle switch) (1977/1978)
The synth unit has a connected power cable, does not include a manual .

Parts of this system are working - but I can not promise the whole system is working"