Yamaha FC-7 compatible with KN5000?

I'm trying to use an FC-7 expression pedal to control on my KN5000, but it works in reverse (up is on, down is off). I bought an adapter to reverse polarity, but the problem persists. Is it just plain incompatible?

Max

Turn your foot round the other way Max - only joking...

Now why didn't I think of that; makes perfecr sense.

Max