A mapping for the Ecler Nuo 4 which as well as a good mixer is also a mid controller (pick one up second hand and you have a bargain) to use with Traktor Scratch Pro.

In midi mode on channels 2 and 3 you have - volume, and 3 band EQs, the gain knob controls filter, cross fader controls cross fade. Low EQ kill switch works as well.    Hold down to toggle between deck target A and B.
Midi channel 5 - Top rotary controls list select up and down, pushing the button selects the track (for the target deck). Rotary 2 controls running through the next hot cue points, and pushing in sets a cue. Rotary 3 sets the loop size by turning and pushing in is loop set. Rotary 4 controls tempo and pushing in Syncs.
The four buttons below (2 by 2) - the top 2 set FX1 or 2. The bottom left is a Play/Pause button, bottom right is a cue button.

When in audio only mode (hi level inputs) the midi channel 5 controls everything as above.
When in audio, if you switch to Layout 2 the top button on midi channel 5 now controls the filter when turning (remember to switch back to layout 1 to use everything else).