Does the DDJ-SB2 appear in the MIDI Studio window of the Audio MIDI Setup application? If not, try disconnecting the SB2, reconnecting it, then click the Rescan button from the top to see if it's detected.
If it still doesn't appear, click the Apple icon at the top left, then click About This Mac, then click System Report. In the window, click USB from the tree on the left and see if the SB2 shows on the Device Tree at the top. If so, click it and post a screen-shot of the information shown below it.
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