DDJ - RB HELP! headphone volume control pitch in deck 2 -

Hi,

in my ddj-rb controller, pitch control in deck 2 doesn't work and the pitch is controlled by the headphone volume. I had already reset and set to DEFAULT MIDI control. I had already change USB port and cable and re-installed driver and rekordbox software.

I'm using a Macbook Pro with High Sierra 10.13.

Thanks