My BCF2000 unit is being analyzed by a technician right now. He will tell me later what's going on and if it has a solution.
If not I will try the above software solution.
If it's a hardware problem I will ask you about what you did with yours.
For better understanding my problem, I've uploaded a video to youtube.
It it you can see that the firat knob works ok, but not the others. Althought 2,3,4... appear to be working properly you can see that there's no linear concordance.
Within the last knob it can be noticed clearly.