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It's partially solved: a couple of organs work ONLY with this strange setting, which I arrived at out of sheer desperation :); a lower keyboard; keystation mk3 0 and channel 9
the other Keystation mk3 2 and channel 1.
so the two keyboards are finally unpaired...
With the other channels either they pair or nothing just works.
I repeat, it is very strange.
Ah, one more thing, maybe your experience can solve it:
I also have an old but good studiologic 990 per that only works on channel 1.
I wanted to use it as a third keyboard or for pedals, but, even if set regularly with "listen to event (it tells me it's on channel 1) I can't show it to grandorgue.