Disklavier

I am using a DC5-pro interfacing to Logic Platinum on a computer.  When 
I send Midi data to the computer, I can only get velocity data between 
20 and 80 unless.  I can get to 100 if I really bang hard on the 
keyboard.  And no matter how lightly I touch the keyboard, I can't get 
a velocity below 20.  Midi should allow values between 0 and 127.  
Anyone have any idea how to get a wider velocity range out of this 
thing?

I've tried both XP mode and Enhanced mode and get the same result.  I 
have also tried changing the volume setting in the Midi Out parameter 
at both 50 and 127 and this doesn't seem to have any effect.  This I 
don't understand at all.

Thanks,

Dave