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Leon BigEars A&H

You mentioned ESB –
If you are using Modular MixRacks with an EtherSound card in the top slot (port-A) of the RAB in the Slave Rack, then you need to pay attention to the ES card routing setup (maybe that ES card was used in port-B before?) Connect EtherSound Monitor program to the cards and check the signal flow for 64 channels in each direction.

please do not adjust your set; normal service will be resumed as soon as possible!