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.

My experience with Yamaha is different. They don't stock spare parts for instruments older than 10 years. Few years before they had different policy.

But here shouldn't be any problem with a pedal. As controller pedal you can try FC7.

Concerning that special pedal unit: from Owner's Manual it seems to contain three switches, but I have no idea how it's connected, as Footswitch female jack on the instrument looks like standard jack. But for three switches we need four contacts...

You can try to find somewhere Service Manual and check how pedal is connected, or open the instrument and check the connection inside.

Daniel Forro