When you apply video transitions in Final Cut Pro X, it also applies an audio crossfade that lasts the same time. There is no option to turn this feature off. This can be a problem for tight interview edits.
There is a way of modifying an edit point so that when a video transition is applied, there is no audio crossfade.
The method is to move the audio part of the edit so it doesn’t exactly line up with the video.
You shouldn’t worry about this being noticeable because FCP can move audio edits in sub-frame units – which are 1/80th of a frame; in the case of 25p timelines, that is 1/2000th of a second.
1. Make sure clips around the edit have their audio and video tracks expanded by double-clicking each of their audio waveforms or by selecting them and choosing ‘Clip > Expand Audio / Video’ (Control-S). Alternatively you can set the timeline to ‘View > Expand All Audio/Video Clips > For All’ mode. This is so you can select the left and right edges of the audio tracks only.
2. Select only the left and right audio edges of the edit – Press Shift-\
3. Move the audio edit one subframe to the left – Press Option-,
4. Select the video edges by selecting the second next edit point – Press ‘ twice (because the first ‘ press selects the right-hand side of the audio edit point)
5. Apply your transition – no crossfade can apply to the audio edit as it doesn’t line up with the video edit.
You can see that the audio waveforms join up with each other without any crossfade.
Once your transition is applied, you can still ripple and roll the clips – even though the audio edit doesn’t line up with the video edit, from a clip manipulation point of view, they are still a single edit.
Check out my free effects and articles on my Final Cut Pro X home page.