Bc2000 (for the BCF2000 & BCR2000)

Hi,

I'm having a problem with assigning pan control (midi controller 10) to one of the knobs. The problem is that the values can range between 0 and 127 in BCF2000, however the pan range in cubase is -63 to +64. So I can only change the pan between center and right. 

How can one assign negative values to parameters in BCF2000?

Thanks,

Ali