There was a great article in TapeOp magazine several issues ago that dealt with building a binaural "head mic". They used a manequin head for that model to try and keep some of the natural facial features in for sonic influence. If you don't have a proper mic pre, what is it you are plugging into? ($50 for a mic pre is amazingly cheap--the ones in my studio run between $1000 and 3500 (just sayin'). Circuit City and Best Buy are NOT places to ask about anything to do with microphones, this much I can wholehartedly assure you (I say this both as a studio engineer and a former Worst Buy employee).
What is the purpose of your binaural mics? Are you using omnidirectional mics? The first poster is correct--you will need two seperate tracks and you will need am audio mixer to "mix down" the two monaural tracks to a stereo bus. Depending on what sort of mics you are using, a consumer level audio card may not be appropriate in terms of operating voltage, gain, or busing.
What is the purpose of your binaural mics? Are you using omnidirectional mics? The first poster is correct--you will need two seperate tracks and you will need am audio mixer to "mix down" the two monaural tracks to a stereo bus. Depending on what sort of mics you are using, a consumer level audio card may not be appropriate in terms of operating voltage, gain, or busing.