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When edit videoclips it´s very important the sync of the audio and music.

How can add a audio track to the timeline 2 (at audio section) and don't link it to any video clip, so if y change the video (in that I'm linking now) don´t lost the music or desynchronized the rest of the videos.

In other words, Its possible have a principal audio track not linked to any video clip?

Extra questions: why it for you the best way to edit videclips (music its the focus) in FCP 10.3?