Roland EV-5 pedal

[Paul Perry]

Anyone ever use one of these as a pedal to generate cv?

It's got a stereo plug, with a pot (8.8K) controlled by foot,
and another pot (50K) on the side as an adjustment.
As you would expect, the pots are in series, so the wiper arm on
the 8.8K picks off a voltage, with the range determined by the 
side adjustment pot....

****BUT!!!!?? here is the problem, the adjustment pot goes to 
earth, not the pedal pot! So, the output (if you ran 15v into it)
is 12.8 to 15, at one extreme of adjustment, and 0.5 to 15 at the
other...

Does anyone know how this thing is intended to be used? (yeah, I 
could just hack it, but it belongs to a customer so I have to keep 
it intact.

Well, I can use an op amp & shift to get a range symmetric around zero,
but I wonder what these things normally plug into? and why like this?

paul perry Frostwave P/l Melbourne Australia