Reply to Regular Vinyl playback in Traktor Scratch Pro

Hey guys, I've been messing around in Traktor Scratch Pro and it's awesome! I have some records coming in from Chemical Records and wanted to know how do you set up Traktor Scratch to play regular vinyl on one deck while the other is playing timecode.

I know this option was very obvious in Traktor Pro 1, but I haven't noticed the Audio Through option in 2.

Thanks!