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My CS80 is SER-NO 1301 but the poor girl is not working at all.
Funny really when you think I restore them all the time that my one
is a big pile of bits in the corner of my room awaiting my attention.
But there is a good reason for this, I have a dream. My dream is to
take this colection of bits and turn it into a super 80. The plans
are drawn up, the money is amassing slowly and with luck there will
be a KSR web site showing what is happening as it happens.
The first thing to do is to build a new wood case for the keyboard
and a case for the panel controls. Then adding all the KSR upgrades
like the unison, cv/gate, cv-initial/cv-after for all eight banks,
19" rack mount psu, and a lage collection of moduels from MOTM or
Synthersizer.com. I am hopeing that I can tap off from the CS80's
main rack certain functions and connect them to jack sockets on the
front panel too intergrate with the rest of the modular to make one
big kick arse polysynth. It would be nice to get the wiggle control
onto the keyboard as well like the GX1 has but I don't think that is
going to happen unless Chris (Old Crow) a synth technician who I
respect greatly can give me some insight on how the GX1 does the
wiggle on the keyboard :)

I must say though that this is not a business venture but simply a
project to see how far the control of the CS80 can be taken. For me
the playing control of the 80 is what makes this baby so sex in
tolex. I am open to any idears or comments on this project.

Till next time.

--- In yamahacs80@..., "kent_spong" <kent_spong@h...> >

It would be nice to get the wiggle control
onto the keyboard as well like the GX1 has but I don't think that

is

going to happen unless Chris (Old Crow) a synth technician who I
respect greatly can give me some insight on how the GX1 does the
wiggle on the keyboard :)

Great, insane project! Just a quick note on the wiggle: I think you
would have to float the keyboard assembly on rubber mounts. Then
you could just have some kind of strain gauge connected between the
keyboard frame and the base frame. I don't know how well it would
work since the CS80's keyboard is much, much heavier than the GX1's,
which I assume is more like the CS60's (or the solo manual, which is
even smaller/lighter).

How about adding the knee lever for the ring modulator!

David

p.s. The subject line is being flagged by my spam filter!

My Yamaha EX-2 (a large stage organ that looks a lot like the GX-1,
though it uses a number of different circuits) has touch vibrato on the
upper manual. The keyboard action itself the the same as in the CS-60,
except it has a small plunger that, when the key is pressed, will rest on
a ribbont hat is stretched underneath the entire keyboard. While pressed,
if a key is moved side-to-side it will likewise impart this motion to the
ribbon, which is attched at one end to the shutter of a light source (the
other end of the ribbon is attached to a ballast spring). So, as the key
is wiggled, the shutter will open and close, allowing varying amounts of
light to shine on a photocell, which then with a simple circuit determines
a vibrato voltage. Note that this is not a polyphonic touch action (it
isn't on the GX-1, either).

Here is a photo I took of the upper manual. The touch ribbon is the
sort-of red stripe just visible below the black steel chassis piece and
just above the styrofoam keyboard contact cover. The tiny circuit board
near the right end is the vibrato voltage-deriving circuit.

The little solo manual on a GX-1 is mounted in a sort of springbox; you
wiggle the key and the entire thing moves around a little, operating a
similar shutter.

Crow
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