You are correct about the 48kHz sample rate. You can use Soundtrack Pro or Quicktime Pro to open the 44.1 audio and export as 48. But, I think this is not alone causing your sync issue. I believe the 722 has a frame rate setting that should be matched exactly to the frame rate the cameras are using. The problem is your cameras may be shooting at different rates. For instance, the Flip may be shooting exactly 30fps while your video cams may be shooting 29.97 or 59.94. I’m not familiar with your cameras. You need to be sure of the frame rates. Now, if the Flip is the only one shooting true 30fps you can use Compressor to change its clip’s frame rate to 29.97 or whatever it needs to be. Once everything is consistent, you should be good to go.
John
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