Reply to Xone 4D, mix, loop, and 4 deck recording

http://www.youtube.com/watch?nomobile=1&v=hn744HvnuWQ

The above link is the video that showed me how I used to record 4 deck timecode dj sets using traktor scratch pro ver 1. That's not me, just a vid I found a few years ago that finally showed me how.

Now traktor changed the way the timecode is assigned and this solution no longer works. I have to give up the 4th deck for a record in, and for the loop recorder consequentially.
The xone has 10 channels, so normally none of this would be a problem. just run the master channel into the 5th set of stereo ins just like an audio10 and bam, ive got everything.
BUT............. my last pair of stereo ins and outs on the Xone 4D are digital coax or spdif. DOH!
I've looked and posted everywhere but here.
does anyone know how I can record 4 decks simultaneously in TSP2 without using other hardware, and if I do, best option?

Thanks a lot guys and gals.