I have a friend who plays his midi Excelsior accordion through his KN7000, with no problems whatsoever.

I recently sold him my KN5000 (to use in a different location) but when the accordion is connected in the usual way it takes two or three taps on each note of the acoordion keys before the KN5000 responds.

Would anyone know if this is a set up problem or possibly a fault in the KN5000?

I have had the KN5000 from new and this is the first time the midi functions have been used.