As far as i know it should not matter wether the buttons are mapped to 'cc' or 'notes' notes but i could be wrong. My suggestion is that if midikatapult does not correspond with traktor your settings could be wrong. Make sure that you have 2 IpMIDI ports, 1 for input and 1 for output and these should be assigned to both Katapult and Traktor and note that the input from Katapult becomes the output in Traktor.
Heres my loopMIDI settings as an example:
Katapult=
in=Launchpad 1
out=Launchpad 2
Traktor2=
in=Launchpad 2
out=Launchpad 1
Hope this helps
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