This feature request needs some clarification. MCU is a pre-defined specification with it's own mapping. We do support MCU mode as one of the three supported modes of operation.
See Section 2.1 of the FP8 User Guide for more information.
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We do believe what you are asking for is the ability to assign your own CC values to customize the FaderPort to act as a Universal MIDI Controller which IS a GREAT feature request!
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