Capturing 4 channel recording (12 bit setero 1,2 mix) into FCP4

Question

Having recorded from the on board mic and radio mic as a 12 bit 4 channel mix on my Canon XL1s, I cannot capture the audio mix. FCP only captures the stereo 1 (on board mic) and not the mix. It recorded well on the camera and I heard the mix on the review of the tape, but I'm struggling to get the mix on FCP (i.e. all four channels).
I've invested £500 in radio mics and the adapter which all work well. Come on you FCP buffs! Other forums have yet to produce the goods. Many thanks in anticipation.
Mark
G5   Mac OS X (10.3)  

Answer 1

I don't know the audio setup of your camera, but if you take it as a straight audio term, a 12 bit 4 channel mix means you recorded one 12 bit audio track that consists of a mix of the 4 inputs on the camera.
I would hope that's not what it really means.
That being said, you can't capture all 4 at once. You have to capture in pairs. Capture your video with channels 1 & 2, then create a new clip with the same in & out points, make it audio only, and change the audio settings in FCP (and maybe your camera, too) to 3 & 4 and capture that clip.
Now put them on the timeline together and link them using Modify>Link.