Multiclip video angle change also changes audio.

Yup, I do. And the display indicates that it's just changed the video; the audio angle stays "selected" in the angle viewer (either yellow when audio and video are from the same camera, and green with only it's audio is selected, with the video angle selected showing a blue boundary) as I change video angles.

I wanted to rough cut the whole thing this way, then fine tune the audio later if I needed to use the audio from one of the other cameras as needed.

I used to do this in FCS 2 (FCP 7) by just stacking the video and audio tracks on the time line, separating the two, then using opacity ramps in the video (or just razor cuts...) and the volume ramps in the audio to mix the audio tracks. That doesn't work with Multiclip (only one audio at a time).

Is there some sort of automatic or default audio cross fade preference that I don't see? I'm new to FCP X since I've just kept using FCS 2 and liked it better. But it's time to move on.

And I notice that even if I just click on the angle viewer on the SAME camera angle that's already in use (the same one that I've selected for the audio angle), I still get a glitch and a volume change. Seems like some sort of cross fade going one where the audio is being playing additively for a while.

I certainly think so. Created a project, dragged the multi lip to the time line, etc.

how could I use the angle viewer and not be in a project?

NNone at all I did analyze the audio and apply loudness, etc corrections

I guess that was it. Each of the clips in the multi clip had their audio analyzed and loudness, hum, and background noise were checked. When unchecked, the issue goes away.

So the question now becomes: in a multi clip where ONE audio track will be used most of the time, but not exclusively, how do you apply audio analysis fixes for problems detected by that analysis? If I have to extract the audio tracks, and edit the audio cuts independent of the video, that's kind of useless, isn't it?

I've searched all over the user guide, and this issue is not mentioned even once. I sort of expected that when I didn't change audio tracks, that it would just be continuous. Silly me.

The video is of a live Shakespeare play (2.5 hours) with three cameras in a live performance not done specifically for video, but for the audience. From time to time, the action, and it's accompanying audio shift to the rear or sides. One of the cameras tracks that action movement, and I want to use it's audio, since the mic was then pointed in the right direction. The cams are Sony HXRNX30U with the included XLR on camera mic (not the build in stereo mic's). Shot in 1080P60.

Thanks, Tom. This has been really helpful. Turns out you have be careful about when you turn the audio enhancements on. What I did was to put the multi-clip in the timeline, separate the audio components, turn OFF the audio tracks I'm not going to use most of the time in the audio configuration (before doing any cutting), select the audio track and THEN enable the loudness/noise/hum removal enhancements, then have at it. Select the audio angle, then do the video angles as I see fit. When I decide to use another audio track for a specific angle section, then switch to that one.

Thanks.