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Hi Graham

Other possible issues off the top of my head would be 2 surface of different types, or 2 surfaces of the same type with different I/O cards fitted connecting to the same rack. Either of these will confuse the preamp / trim settings, as each surface informs the rack of its local I/O cards at boot up, therefore the last surface to boot will win. The Rack is only aware of a singular surface, so there is a potential conflict there.

Like I said before its not something we support or recommend. If you have the hardware and want to give it a go and can cope with the oddities, then let us know how you get on, but your off piste so to speak !

Ill make sure the multi surface support is added to the list.