Hi Max,
assuming the electronics are all original, the Knobs are of the following configuration: - The Volume knob has a +10dB Boost on Pull- The Knob closest to the pickup selector switch also has Push/Pull and engages the parametric EQ. Whenn pulled you can boost or cut a frequency, which you set by the middle knob. - The last knob is a "regular" tone control.- the little switch between the tone-knob and the frq-knob is a phase switch and you can put the pickups in or out of phase. (not totally sure here though)
The output on the side is a normal output. The one on the top though bypasses all electronics but the pickup selector and the phase switch. (so all knobs are inactive) so it's kind of a "studio"-mode.
Hope I could help :)CheersPhil
P.S. are you sure the green is not original? there have been some strange colors from Vigier :P