VOLUME PEDAL PROBLEMS

I have a Yamaha volume pedal, a Triton and Cubase 6. In Halion SE, why is my volume pedal controlling the MASTER VOLUME and the BRIGHTNESS knob on “Black&White Ballad”. That’s just an example - the volume pedal effectively controls the VOLUME and the first KNOB on all the sounds. This also carries on to other plugins but I thought I’d start here.

And yes, I’ve tried the FORGET CC on the knob but it still moves. I can do the FORGET CC on the volume slider and it does forget it. If I do a new LEARN CC on the knob then it follows the new CC as well as the volume pedal? Strange. Any ideas?