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Thank you jeff
You are right.The problem is an hardware bad conctat. May be on RAB2 module or on MADI card itself. I tried to tighten screws for ending set up and suddendly the MADI connection stop working.So just open the screws a little bit an it returns to work. So I am in contact with local vendor for a spare or a tecnhical overview. However, for a while I tested the system and I find it very powerfull,especially for the virtual sound check way. This is a wonderful tool for sound engineers.Thanks a lot.