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Hi Pealsound

It is best practice to have all units running the same firmware version whenever possible.

This should not be a cabling issue if the iLive connects and works correctly, and you said that you can get MIDI out of the mixrack and surface OUT ports correct?

Can you try a MIDI learn function using a DAW application e.g. Ableton live just to see if you can get that working?

what are you trying to control exactly?

Sam A&H