Hi,
There is a long-standing problem with using two or more KeyLabs (mkII etc) in the same setup. Irrespective of MIDI channel, MIDI bus etc, the UI of Analog Lab (or any other Arturia plugin) will only appear on the first KeyLab to be connected. Arturia support has confirmed this to be an architectural problem with the hardware, software or both.
Has the MarkIII been designed so that two of them can be used with Analog Lab (etc) on the same MIDI setup, and have the UI of two instances of Analog Lab display on the correct controller?
