There are several fantastic Traktor external controllers like the X1 and S1 (sample player) which again, have both swiftly become industry standard. You will need a compatible external sound-card (go on native instruments website to check compatibility) to utilize an external mixer OR a Traktor in terface (all in one controller + mixer - TRY BEFORE YOU BUY ! ). Traktor is the industry standard DJ software. Industry standard professional DJ software.