Hi I am a mobile dj and in my setup I have two completely separate setups a Numark NV that I switch between Serato and Virtual DJ8 and A Kontrol S4mk2 with an F1 running Traktor through a line mixer to a digital processor / crossover to a pair of powered double 10 subs and a pair of double 6and horn mid/ high boxes. It may seem a bit excessive but since we mainly do weddings it means we always have backup if anything crashes and different programs work better for different things.. Anyway I was wondering if I could add a D2 to my traktor setup as well ready for stems and such or should I just replace the f1 with the d2 or get an s8 to replace the lot .. You're thoughts please..