Once you import the footage into Avid, it gets turned into an Avid MXF file. The file name becomes and Avid name, and the audio/video affiliation is now controlled by the Avid software. This is why it is pretty important to keep the original P2 files backed up...those are your master tapes.
But, not all is lost. MXF4Mac allows FCP to see those Avid MXF files. It will import audio and video as separate files, but you can use the MERGE command to make them into one clip.
Shane
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