Reply to TSP With Denon 1600 and 3700

Can you guys tell me what I am doing wrong? I want to run the 1600 with Traktor Scratch Pro and use the 3700s in midi mode to control decks one and two. Decks three and four can remain internal. I am able to get sound without the audio8 but I am not able to control the tracks with the 3700 platter. I must be missing a step?

http://www.youtube.com/watch?v=P1zHJxxrUZo