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Oh, yes. I trimmed them afer I synched them to make sure they all started at the same time. I produced the clips after they were trimmed. There's something funny going on -- I'm working on it. Stay tuned.
OK Here is a step-by-step of what I did and what worked / did not work
1. I recorded with my Iphone Video1, Video2, and Video3 of myself singing a soprano, base, and tenor part. These were each recorded to the same piano music being played by the computer. These files were saved as Video1.mp4, Video2.mp4, and Video3.mp4
2. I opened Powedirector, imported those three files and placed them on the timeline. Of course, at this point they were not synched to each other.
3. I placed the three files onto 3 separate tracks in the timeline, selected all three files at once, and did Synchronized by Audio. Although each track had different audio (a combination of one of the voices and the piano track), the process did seem to synchronize the audio.
4. I placed the cursor near the beginning, split each track at that point, and removed the section on the left, thus trimming the three tracks to all start together at the beginning.
5. I produced each track separately for use in a collage, since they were now synched.
6. I opened a new project in PowerDirector and imported the three produced tracks. Then I put them on the timeline to test their synchronization, and the sound seemed synchronized.
7. I removed the tracks, opened the Collage designer, picked a 3 part collage, and put each track in one section. Then I played the result, and discovered that, while the audio sounded synched, the accompanying images in the collage were badly out of synch with the sound.
8. Finally, not trusting the Collage Designer, I decided to produce the resulting video anyway, and to my (pleasant) surprise, it seemed to work, with video images being in synch with the music.
So my conclusion: The Collage Designer cannot be trusted to accurately play / display a collaged video -- you have to produce it to see the real result. Maybe you already knew that, but I spent a lot of time trying to figure out why the images were going out of synch with the sound when I played the collage in PowerDirector,