Reply to ddm4000 midi setup to traktor scratch pro

hello guys,i need some help on how i can be able to use my ddm4000 as a midi control of my TSpro?im havin a headache lastnyt figuring out..this is what ive done last nyt...(with an ALESIS usb to midi cable) i plug the midi out(only) at the back of my mixer (midi output) then i plug the usb to my computer with TSpro,ofcourse the comp recognizes it then i tik the sampler,mic (box) as well as ch.1 and 2 of the midi settings of the ddm4000 aftr that i go to my controll mngr settings on TSpro and import the ddm4000 tsi but it ddnt work...

i wonder where did i go wrong?do i need to plug my audio 8 as well?am i using the right usb to midi cable?