Traktor Pro + Mixdeck + Vestax Spin/Typhoon

Hey guys. I got a Vestax Spin for xmas and I thought I'd mess around with it instead of bringing it back. I have a Mixdeck for decks A and B and I would like to use the Vestax for decks C and D. I'm not concerned about mapping, just audio routing. Does anyone know how to route this? I read that ASIO4ALL could sort this out but I have a MacBook Pro and it seems that won't work. Any help is greatly appreciated. Just to clarify, I'm not running Traktor 2.

I think I can shed some light on what's going on here. I want to make an aggregate device using the outputs from the Mixdeck and Vestax. I know how to do that but here's the issue. The Mixdeck doesn't show up in the Audio MIDI Setup. I can select it in Traktor, but I can't select it in Audio MIDI Setup to put it into an aggregate device... Any thoughts?