Reply to VCI-100 and LPD8 on TRAKTOR PRO Scratch

Hi. I am a Turtablelist type of Dj and now trying to move along with the crowd. I have VCi-1oo, LPD8 and Traktor Pro Scratch. My questionis how can I make VCI-100 and LPD 8 work at the same time with Traktor Pro with out changing my midi controller selection on Traktor Pro?