I assume you strictly mean multicamera sequences and not simple audio/video merged clips.
When constructing a multicamera sequence, I lay out the cameras and audio as usual, I then unlink all camera video from camera audio, I select all the video and nest it, I convert the nested clip to multicam. I now have multicam video on top of totally independent normal audio. In most cases it’s better to mix the audio like this so all sources can be subtly mixed instead of relying on the multicam audio cut which is utterly frustrating and kind of useless if you have additional audio tracks beyond the number of cameras you have.
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Angelo Lorenzo
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