I don´t know if the Keys´s LEDs light up while you play on the other keyboard, but with another keyboard attached they should still light up when you press the step the chord is on and you can still see which cord it is. Would be strange if this would be disabled, from a programmers point of view.
No guarantees here, I never hooked up an external keyboard to my keys, cuz it haz keyz! :smiley:

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