Recorders and Players
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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I think that (though you have not specifically stated what kind of ADAT you are asking about) you might have a need to check connections and re-seat cables. A lack of function on the last four channels and function on the first four, might mean that you have a one-bit error in selecting channels, which could be caused by a missing wire in a connection (one bit = one wire, in a parallel pinout connector/cable.)