Hi

Well I don’t suppose you are looking for or likely to find a standard single clock source generator, on frame by frame second by second time code locked to both on the domestic market.

But as said above the error can be kept to an acceptable amount even by doing both on separate non common clock devices. Providing you take care to give yourself a good visual to sound synch start point, all la clapper board.
Or as been said by using the live camera sound as a guide.
These ad hoc wild tracks can run for quite a long time close enough.
If you do start to get creep try to edit or lengthen the video by a few frames it is much less noticeable than a glitch in the sound.
Have fun
Mike

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