Offizieller Kommentar
@Alex > The MIDI Maps forum is ONLY for posting maps, as it states in the forum details:
Do not post requests for maps or any other topics in this forum, it is for MIDI maps only. Any user not adhering to these rules will have their post(s) removed.
I have moved your post to the XDJ forum instead.
If you have mapped your headphone volume knob, you should un-map it as it will also control the audio level through your headphones as an audio control while still sending MIDI signal.