This is always a confusing topic with DVCPro HD, but to the best of my understanding, DVCPro HD always records tape at 59.94, but you can flag the variable speeds on the tape so you can extract the frame rates later. But when you’re recording to tape, no matter what frame rate you choose, the deck always rolls at 59.94. So you can lay out your 23.98 timeline to the 1200A, but duplicate frames will be added by the deck, just like they are during camera capture. To me they’re completely imperceptible, but they are there.
What you do is ensure your User Bits are turned on, Set the TC for External, Set the Video In for Firewire, Hit Play on your Timeline and Record on the 1200A.
FCP will feed the TC and video down via Firewire. You’ll end up with a 59.94 tape with the 23.98 frames flagged.
You can certainly post this query on the Varicam forum as well as Jeff Merrit from Panasonic regularly posts over there and he’s the one who finally wrapped my head around what the 1200A does and does not do.
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