No headphones output avaible in Rekordbox 5

Hello,

I have a problem. I turned on Rekordbox, but I didn't have any sound outputs, so I set them. But in Headphones output I have only output Line (Pioneer DJ DDJ-RB) 1/2, so the sound is in the speaker, not in the headphones. I tried to reinstall Rekordbox 5, reinstall DDJ-RB driver, but it still isn't working. Can you help me? I have Windows 10, lastest Rekordbox 5, DDJ-RB and headphones are HDJ-X10. Thanks