Traktor Pro2 and the VMS4 recording problems !

Hi Guy
If you can't control Traktors interface on screen this won't be because of the mapping it will be an issue with Traktor. I would start by making sure you have all the latest updates, then check your latency settings. Also, make sure you turn off all the background program's like your firewall, anti-virus, wifi, basically anything you don't need.
I not sure which Mac you've got but 4gb RAM would be advisable

There seems to be some peaking of the sound before the first distortion at around 8.09mins.
There's a drop in sound around 59sec unless it's the mix and a second distorted section at around 22.34mins. As you sound output from the controller doesn't go back to the laptop I leaning toward a software, latency or memory issue. i'm not a Mac user but had a few issues with Traktor until I fitted more RAM now I'm good to go. No more programme freezing or sound issues. The next time you mixing keep an eye on the CPU metre at the top.
If you search the net you may find a programme to disable all non-essential programmes by clicking a single button for when your unsung Traktor.
Other than that visit DJ Techtools for advice, it's the best place to go if your unsung midi controllers.