Reply to Routing a Synth into Traktor

Hi everyone, I got this piano http://www.pawnmart.com/?itemid=21474886097 , and want to know how can I setup it to use it at the same time of traktor, to improvise or create riffs over the actual song in real time, using the loop recorder.

Also I will need to get through ableton first or other program that can give me more sounds, because the ones i got are awfull, wich program can do this?, I dont want all the functions or ableton, just the midi instruments. I was believeing Reaktor ?? What do you believe?