Reply to Help recording a mix to my laptop

I know this may seem a n00bish question, but I've been having trouble trying to record a mix via my CDJs. Previously I have been recording my mixes through Serato ITCH with my VCI 300 and before that I was using my CDJs and old laptop which has since died.

I had no problem recording with my old laptop, and recording via serato couldn't be simpler. However my serato recordings just don't seem right. I don't know if it's just me but the audio quality is a bit lacking, most notably in the bass. Now, I don't know if that is a problem with my laptop's soundcard or the controller or the software, but I intended to find out by recording mixes using my CDJs and laptop.

The thing is, with the laptop I am using at the moment there is no line in port on the side, just a mic in and a headphone in. I tried plugging the dual RCA to 3.5mm into the mic in port and recording that way, but it didn't pick up much sound; and by that I mean there was a waveform on audacity but it was so low that it was not audible on my laptop with the speakers on full.

If it helps I am using a Korg KM 202 mixer; the back looks like this:



I currently have the master out RCAs going into the speakers and I thought that plugging the dual RCA to 3.5 mm cable from the booth out to the laptop would be suitable for recording. But I was faced with the problem in the previous paragraph.

Is this just a simple connectivity problem, or is it just the fact that my laptop is not capable of recording mixes due to the lack of line in port?