Have tried a bit of a search but nothing answered the issue directly...
When I highlight, for example, 4 clips and a seperate audio file within FCPX and click "synchronise clips" one large clip is produced. Audio and Clips sync but during the parts where there was no footage (only audio) it is black. It takes me a lot of time to go through the clip and cut out the black parts. (please see attachment for screenshot)
I am wondering if it is possible to produce synced clips like those produced by plural eyes?
If I go through and do each clip and audio individually then I still get black when there is only audio and no footage.
Your screenshot shows that you didn't yet understand one of FCP X's prominent paradigms: exploiting the power of metadata.
You wouldn't else edit the synchronized clip in the project. The synchronized clip is technically a new subclip, not footage. It helps if you consider ALL clips subclips. You organize clips in the browser.
The four video clips are synchronized clips of their own, video synchronized to audio through timecode and a description in the file that they belong together - metadata. By adding another audio source, you created a new subclip. If your intention is to only use the external audio, you should de-check the camera audio of the synchronized clip in the browser (!) in inspector.
You go on by selecting the usable parts of the SC in the browser and by - for instance - hitting the f-key. Thereby you created four new subclips. You almost never would edit un-favored, un-tagged and un-filtered clips into a sequence.
You get rid of the black chunks by clicking in the smart collection favorites beneath the library icon - they're "gone" instantly.
To take the organization of metadata (those embedded in the footage and those you added yourself) to a new level by making your own, omnipotent smart collection:
You not only don't see the wood for the trees, you don't see the comfortable path you're standing on. Hope I could help to let the penny drop.
...Audio and Clips sync but during the parts where there was no footage (only audio) it is black. It takes me a lot of time to go through the clip and cut out the black parts. (please see attachment for screenshot)...I am wondering if it is possible to produce synced clips like those produced by plural eyes?...
Actually, in your specific scenario PluralEyes does the same thing as FCPX. You have continuous audio bed underlying discontiguous video clips. That audio is potentially important, so neither PluralEyes nor FCPX will delete that. PluralEyes 4.1.3 does have an export option: "Creates an additional event with the audio clips trimmed to match the length of the corresponding (synchronized) video clips", but in my testing this does not work. It may be a bug in PluralEyes.
In the case of discontiguous pairs of sync'd video clips there is a behavioral difference between PluralEyes 4.1.3 and FCPX. Consider the case where CamA and CamB are both running, then shut down 5 min, then both running again. This produces four clips, CamA_1, CamB_1, then 5 min later CamA_2 and CamB_2. When sync'd by FCPX in a multicam clip, the 5 min gap will appear in the MC clip between the two pairs of sync'd clips.
By contrast the exact same cameras and clips if sync'd with PluralEyes and imported as a MC clip into FCPX will have the 5 min. gap removed. This may be what you're talking about.
There are probably valid reasons for FCPX and PluralEyes each handling it their own way. The PluralEyes method does seem more useful if you have many "sync-able" cameras doing stop/start shooting over a long period. It automatically eliminates the gaps. The FCPX method seems to prioritize maintaining an unbroken contiguous timeline.
However I have never seen the FCPX behavior to present a major problem. With ANY material -- whether multicam, sync'd clips or whatever -- you always want to skim those in the Event Browser and mark favorites, rejects and keyword ranges -- before you put anything on the timeline. There will *always* be large discarded regions -- what difference does it make whether those are black?
FCPX is designed to work this way -- you do your initial work in the Event Browser, not the timeline. BTW in general it's better to use a multicam clip vs a sync clip -- even for one camera and one audio track: www.fcpworks.com/sync-or-multicam-clips/
Here is an older but still valid MacBreak Studio on Warp Speed Keywording:
Warp Speed Organizing:
Ripple Training has an updated class for 10.3x called Warp Speed Editing: