Vintage Synth Repair

Hello- Somehow I have, presently occupying an inconvenient proportion 
of my living space with its considerable bulk and mass, an old Yamaha GS2. 
Judging by dicussions I have had with people in the keyboard 
departments at a couple of different outlets, its no surprise if that 
is an unfamilar model these days. 
For myself, I have no practical expereince in this field, therefore a 
question for those who may know what I'm talking about. I am reticent 
simply to throw it out- it does emit sounds when plugged in and 
subjected to pawings upon the keyboard- but these sounds are somewhat 
uncontrollable. This, I gather, may be because the pedal unit is 
missing, and I suspect that, though it seems ani-intuitive, not having 
a pedal unit plugged in leaves it in a state similar to having an 
infinite sustain pedal permanently on. 
It originally would have had three pedal unit, but of course the right one cannot be found,  as of a long, long time ago. Would a pedal 
unit from some current model work, at least electronically even if not 
designed for the best physical fit ? I have seen some in some 
catalogs, but they cost a bit more than I would want to chance on an 
experiment.