If TRAKTOR does not respond to the mid-EQ knob on your MIDI controller, you are probably using the Xone EQ Type in TRAKTOR, which is a 4-band EQ.
Since most DJ MIDI controllers only offer 3 knobs for EQ control, you cannot control all 4 bands of the Xone EQ model.
We recommend to use one of the other EQ Types (Classic, P600 or NUO). You can change the EQ Type in the Mixer tab of TRAKTOR's Preferences.