Reply to Filter effect on Xone K2 and tractor pro

Hello,

Why is the filter on Traktor Pro using Xone K2 mixer flat?

When I use the filter on a track it almost cuts the sound out completely
instead of keeping the treble and losing the bass or vice versa.

Does someone know how to fix this?

I just want the filter to to fade the sound like on a standard mixer..

Thanks,
Digi