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the problem with those with the built in relays is that the relays are not wired for MB as in the diagram shown at the top of this thread. they are wired on the pcb to address most applications except MB - can't have it both ways. to re-wire for MB may require some surgery on the pcb. the only way to have a truly "universal" unit of this sort is if they built it so that the relay connections are reconfigurable...
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