Final Cut Pro 12.4 audio dropouts when exporting with Voice Isolation

I’m experiencing audio dropouts in Final Cut Pro 12.4 that appears to be caused by Voice Isolation.

The audio plays normally in the timeline, but after exporting, I get occasional very short gaps/dropouts (a split second). If I disable Voice Isolation completely, the exported file is clean. I’ve tested Voice Isolation at both 50% and 25%, and the issue still occurs. I’ve also tested both H.264 and HEVC exports with the same result.

Even sending to Compressor didn't make any difference.

Has anyone else experienced this with FCP 12.4? Is there a known workaround?

Thanks for your help.

MacBook Pro 16″, macOS 27.0

Posted on Oct 6, 2026 9:07 AM

Top-ranking reply

Joe Redifer

Level 2

204 points

Posted on Oct 13, 2026 2:46 PM

Over on Reddit someone found a workaround. On clips that you have Voice Isolation enabled, put them into Dual Mono mode, not Stereo. Seems to fix the exports.

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17 replies

terryb

Level 4

3,850 points

Oct 13, 2026 3:01 PM in response to Joe Redifer

Nice find. Thank you for sharing a workaround before a fix is released.

Oct 16, 2026 7:58 AM in response to Julian Liurette

Actually, even when putting in dual mono, the issue still occurs. So unfortunately, that workaround isn't reliable.

Final Cut Pro 12.4 audio dropouts when exporting with Voice Isolation