The problem is that LEDs don't respond to output mappings in Traktor (v 2.0.1).
In-/Out-Ports are set to "Launchkey 49", input and output buttons are mapped to the same function and note ("Play/Pause", Ch10.Note.E2, for example) and to the same deck. I've played with Controller/Midi Range values, but nothing happend.
For Launchpad this method works fine. What's the problem with Launchkey pads? I mean, it's not a hardware issue - in Ableton with InControl mode ON pads worked as it should be (green, yellow, red; different brightness; blinking etc).
P.s. Already wrote to support about that. No response after 5 days.