Inside your multicam (assuming its 1080) select the Angle with the 4K and set Spatial Conform to Fit to see the whole 4K. Then you can scale up/down to suit.

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You could open the multicams in the timeline and relink to the same audio files - forcing a rebuild of the multicams audio. If the beeping persisted then you can cross FCPX 10.3 off the list of culprits.

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