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CS does not have reusable design blocks in the sense of a schematic block associated with a pre-designed PCB section that can be replicated any number of times. Hierarchy and repeated schematic blocks are supported (a block is simply a schematic sheet with the necessary connector elements). The big thing is that there is no automated way for you to lay out one channel on the PCB and replicate this up to 128 times, it would be a manual job. As such I would advise using AD18 for your design.