dvs setting with technics 1210 dam 450

Good day dear alls, I have recodbox dj license activate for dvs, I connect my djm 450 and usb, the dvs get signal form my technics sl 1200 , calibrate ok, but when I move audio file by desk 1 and 2  with turnable Botton start does t start the song ...

I did many tests but I don t know what to do.

please help me....thanks