Reply to S4 in midi mode as Ableton Live Controller

Hi

I'd love some help here.

Using "shift" browse i switch my Traktor S4 into midi mode. no issue. It's ON. Ableton 8.2 is open and i switch it to midi. Blue covers all the spots. Then i twiddle a knob or move a slider on the S4 and... a big nothing.

As i understand it, and maybe i missed the plot completely, what should happen is that adjusting a device, lets say the deck A volume on the S4, woud map said volume knob to what ever aspect i has selected in Ableton, lets say a macro controller i'm running bass frequency through.

Nada. F-ck all.

Any tips? I'm sh_tting here. Please help.

Thanks