yes Cryptik but you told me that if i want i can change the 1/3 gtls or the 0/2 gtls ...

so i can put this settings:

GTL Ref 0 = +30mv
GTL Ref 1 = -10mv
GTL Ref 2 = +30mv
GTL Ref 3 = -10mv

cause i've the same result ... correct?