S2 turntables, A6 cuing help!

Thanks for the help the other week, I have x2 vinyl tt's using the s2 as the mixer and A6 as the sound card. I have followed the instructions but just can't get the cuing to work. What do I do? I have headphones plugged into the A6 but only hear the song playing.

Thanks in advance

Thanks for all the replies :blink:

Got all the help needed from the NI site.