Aight, did a little RTFM and figured out how to get the Mac to recognize my CDJ-350's. I've never mapped anything before, so before I get too far I want to confirm I'm doing this properly. I'm in the Controller Mapping part of Traktor's preferences. I've got device set to Generic Midi. The default for "In Port" is "All Ports" but I can't seem to learn any button presses. When I set that to the target CDJ-350, I'm in good shape. I set the cue & play button and it seems to be okay. However, I'm using the default VCI-100 mapping (no mixer yet). Seems weird that the two devices mappings are clumped together. Maybe that's just me.