FCPX 11 audio doubled issue

it's really annoying me, and my client. I thought that was my speaker delayed, but not. When i press pause and then playback again it disappears.

Have you enabled noise reduction or voice isolation in the inspector?

It is probably not a coincidence that at that point in the timeline, and at around 33:10 also, there are two copies of a synchronized clip. I know that the top one is disabled, and so it should not play at all, but something went wrong and it is causing an interference (unless it is not, and you add some distortion effect to that clip).

Is there a specific reason for these two copies?

I'd make a snapshot of the project, to be safe; then I'd try selecting each the "HP_AROLL - Sync..."

and press Command-Option-DownArrow to overwrite the disabled version in the primary storyline.

Then try exporting just a short section including these clips, and see if the distortion still occurs.

It is indeed perplexing.

If you haven't already, try deleting FCP preferences. Corrupted preferences can lead to many sorts of weird behavior.

To delete preferences, hold down command and option while starting the application and click Delete Custom Settings. The application will start with default settings and open an "Untitled" library. Adjust the settings, reopen the library you were working, and see how it works now.

If the problem persists, there may be something else playing a role in this.

Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

You have "cleanmymac", which many of us here consider to be malware. It has earned the not-so-nice nickname of "brickmymac".

You should begin by completely uninstalling this darned thing.

You are running low on system drive free space (just above 10%). It is usually recommended to have at least 15-20% free space on the system drive.

You have expressvpn. Unless used to create a tunnel to a work or school network, according to their instructions, vpn are not improving your security, indeed more the opposite is true.

See Public VPN are anything but private

You have old extensions that do not work in recent systems, like Soundflower. It was great, but has not been updated in years and does not in Sequoia (in fact it did not work already in Ventura, I think).

Those old samsung drivers are not needed at all, and could cause problems accessing your external drives.

For many years now there has been no need for drive manufacturer sofware, as your Mac can use the drives with the system software alone.

You have the google updater and keystone things - they are known to severely affect video applications by hogging the system videotoolbox.

Completely uninstall Chrome and particularly its background tasks - see https://chromeisbad.com

Then delete and reinstall FCP, and see how things go.

Due to the sheer amount of extensions, agents and daemons, I'd seriously consider doing a clean install.

Probably several of these things were installed years ago, on a previous mac, and migrated.

It is recommended, when migrating to a new mac (and especially going from intel to m1), to migrate ONLY the user accounts. This way, one keeps all the personal stuff but starts with a clean system.

“I don’t think that’s the case because I’m a feature film editor, and I use only synchronized clips. However, some clips in the timeline have double audio. Not all of them have isolated tracks enabled—just some of them, and it seems to happen randomly.”

Same issue here with audio doubling on export randomly.

I notice it happens with synced clips (in my case, 1 boom and 1 lav on a multi clip). Audio is from Zoom F8NPro 32 bit float.

Troubleshooting: Restarted. Shut down and rebooted. Tried 3 different computers M1 Pro, M2 MAX, M2 ULTRA. Reinstalled FCPX. Deleted preferences. Checked for filters/effects but am not using any. Have added some filters/effects to see if that helps. Exported different audio settings. Exported audio as separate roles. Checked bit rate in project settings. Still no change.

I exported my lav and boom separately and brought it back into FCPX. I can see one of the tracks lines up with my edit just fine, the other seems to be shifted in one direction or another from clip to clip.

You can hear the problem occasionally during playback in fcpx timeline but then you can pause, start over and it goes away. I have some projects using the same audio clips exporting fine, but these specific projects keep doing it over and over. I have copied them into a brand new library with a brand new project and they still export with the same doubled audio. Huge glitch here I can't seem to troubleshoot on my end - would be great to get some apple support quick on this one.

Has anyone found a solution to this?

I have the same issue. Have you had this issue and have you solved it? Can you explain how to do this? Hopefully, it's something other than allowing only 1 channel to play through. If the audio is synchronized both tracks/audios should be able to play simultaneously.