Final Cut Pro 6: Subclips in multiclips in mixed-frame-rate sequences
Symptoms
Normally, in cases where a subclip's frame rate and a sequence's frame rate do not match, adding the subclip to the sequence may cause the subclip limits to be adjusted and new clip In and Out points to be set. This is normal, and these adjustments ensure that the edit you perform has the starting and ending frames you would expect.
An exception to the behavior described above can occur if you use multiclips which are comprised of subclips which have a frame rate that is different from the frame rate of the sequence you're editing.
Products Affected
Final Cut Pro 6.x
Resolution
In such a case, when you add the multiclip to the sequence, the subclips' In and Out points may not be adjusted, resulting in a possible discrepancy at your edit points. In such a scenario, it may be necessary to adjust the edit points in the Timeline very slightly to ensure that the starting and ending frames for clips in the multiclip are precisely as desired.
Additional Information
Related Document
Final Cut Pro: Multiclips may lose sync if "Remove Subclip Limits" is used