We already talked about that, see Additional MIDI controller as an E1 expander - #16 by Abbes.
Right now you are mapping Midi CCs → Slots. But i think, you should map MidiCCs → Controlset+Pot. As with non-Standard Graphics, you assign a Controlset + Pot Combination, to control a Function. Means if you assign MidiCC 13 to Control Pot1 on ControlSet 2, this MidiCC will allways control the same, as Pot1 on ControlSet2 would control, no matter to what you assign this Pot. Thus you are not Bound to the Slot.
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