I’d take back the pioneer unless you’ve decided its what you want and order the xone you wanted off the net, i get it all the time here in ireland, go to local store, tell them what you want, they say am no we dont stock that, we stock this, push push push,
i say but i want the other, they tell me its the same thing, i know its not, so i cant help the local bussiness as he’s unwilling to help me so i order my kit from a stranger in germany,
next time i pop in he accuses me of just using his store as a demo room, to which i reply, how, you dont stock anything i’d be interested in demo’ing.
as for you question, you want to run 4 decks out of traktor into the djm, you’ve 2 choices, run 4 mono decks out of a dj4 or 4 stereo decks out of a dj8,
most clubs are mono so i run 2 decks out of a 2channel card using mono splitter cables,
you’d have to make these leads yourself, or you can buy an 8channel card and just use regular phono leads, if you want to move into production the 8 channel card will give you more options in the future so its not money wasted,
as for the cdj’s, if you’re using them with control disc for traktor then no worries, they’ll connect to the audio 8 but if you want to spin regular cd’s you’ve got 2 choices.
connect them direct to your mixer to the same channels as deck 3 and 4 of tracktor and use the source selector switch to pop them in and out or hook them up to traktor and use the software to route the audio thru to the mixer.
my main point is dont be pressured into buying kit you dont want or is second choice just
cause the local guy doesn’t offer a good range of kit. its your money so its your choice not his.