Right , it works fine with that virtual cable . Here's how mine works : in Spark choose Asio Drivers , Midi Output to loopbe and the Midi clock intput also to loopbe.Finally , and that's why it didn't sync properly , make sure that on the spark middle interface the knob with written tempo on it is down to nought ( next to tap) .
Also you need to set up traktor but I think the previous post contains the right link.
Works for me