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I'm not a VP or 621 person, but assuming that the VP is making a decision based upon content (interlaced vs. telecine vs. progressive), rather than source, surely the VP can still go after the 621 since the content will remain consistent no matter where it is placed in the chain?

The VP50 maintains lipsync by adjusting the amount of audio delay. If you don't feed the audio into the VP50, it can't delay it. smile