The X1800 is not Traktor Scratch certified, so you still need the Audio 10. Although there's a rumor they're working on support for the SC5000, so maybe they'll certify the X1800 as well.
The eBay listing doesn't say whether it's MK1 or MK2 vinyl, I believe you need MK2 vinyl if you purchased Traktor Scratch after version 2.1.1.
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