OK. Get yourself a couple of RCA to 1/4"phono adapters to go on the cables you have. Plug those into the "inserts" on the backside of the Mackie for channels 1 and 2. What this will accomplish is what ever you plug into these two channels will only go thru the pre amps and not the whole mixer so you've shortened the signal chain giving you a cleaner signal. You set the recording levels with the trim pots (the little black pots at the top of the channel strip). When hooked up like this, the rest of the channel strips of 1 and 2 won't be active (EQ, pan,etc), but that's not a downer cause IMHO you're better off with a hot, flat and dry signal going to the computer that you manipulate later. To take this to the next step, take another cable like the one you made your input with and run it from the sound cards line output and plug that into channels 11 and 12 of the Mackie. Being a stereo channel, it gives you playback level control over your computer while tracking. Take the main outputs of the Mackie and plug that to your monitor system (aux. inputs on a home stereo or some such beast). This will work out real nice for ya. Good luck and if you get confused on any of the above babble e-mail me and we'll get ya straight.