Reply to Timecode problems

I just got two turntables, a mixer, and an amp from my friend. His uncle used to be a DJ, he got the stuff from his uncle, knew I was a DJ, and I got it free. I bought two serato timecode vinyls to go with them. At first I only had one timecode going, so I just went Decks -> Mixer -> Amp -> Mic input on my computer. Dialed in the vinyl, worked like a charm. Put the second timecode on, set VirtualDJ to two timecodes, and it said I didn't have enough channels. I figured it must be because I have to run it through a soundcard, but I wasn't sure if that was the case or not and if I had an issue with the ASIO driver. If it IS the case, I want to know if I could use my Lexicon Alpha recording module as an interface. It has one Red&White output, two 1/4" outputs, two 1/4" inputs, one 1/4" instrument input, and a 3.5mm mic jack.

Thanks,
Spencer