Yes, you can use the DB2's sound card to record via USB. I'm assuming it'll work the same as the DB4, they have basically the same sound card.
In the menu, there's an option called 'USB routing'. In there, choose one of the 4 available sends and select Record. Again this is on the DB4 but the DB2 will be broadly similar:
Attachment 14775
Now, in traktor input routing, select the DB2 send you've used as record in one of the input channels. Since you're not using timecode or live input to traktor, it doesn't matter which one you use. If you've used send 1 it'll be channels 1 & 2 of the DB2 sound card, if you've used send 2 it'll be channels 3 & 4, etc. Then go to mix recorder in traktor settings, set it to external mode and select whichever input you've chosen as the source. Now pressing record in traktor will record from the DB2's record out.
Is that clear enough?
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