FYI -
This evening I learned the hard way that Mac OSX Sierra (final) and the DJM 900 mac drivers do not play well together within Traktor (latest). When you plug the mixer into the USB, you get an audio routing popup and everything appears to be fine. Once you're in Traktor, you can't play anything. Literally, the play button will NOT work. If you switch to the internal sound card, Traktor plays, just not out of the mixer's sound card.
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