Sound and video synchro writing video to disk through USB

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Hello, I'm trying to write video to disk from a miniDV camera (Panasonic NV500) through USB. Either if I use jit.qt.grab "write" message or if I feed a jit.vcr with the matrix from the jit.qt.grab the video is always behind the sound. How can I solve this problem?
The reason I'm not using fireware connection is because I need to use more than one camera and in MacOS apparently is not possible.
Thank you very much!

I'm running a MacBookPro 2.66 Ghz Core 2 Duo 4 Gb