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Garageband AU Multiband Compressor UI not working

I recently updated my Macbook and after updating, the Garageband AU Multiband Compressor UI is not displaying properly. I have reinstalled the sound library, as well as Garageband itself and still no luck. It seems that all other plugins function normally, but this plugin's UI specifically is not working properly.

MacBook Pro 13″, macOS 10.14

Posted on Oct 8, 2023 5:29 PM

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Question marked as Top-ranking reply

Posted on Nov 4, 2023 10:19 AM

I have a similar problem with AU Multiband Compressor when using it with Final Cut Pro. It is my go to compressor when mastering the sound tracks.


After adding it to a clip, pressing the icon next to its name to bring up the graphic adjustment window crash quits FCPX every time. It worked until I upgraded to Sonoma.


I have sent a bug report to Apple because I really need this effect - I'm sure there are other similar effects, but I have all my presets for this particular effect and know it like the back of my hand so don't have to think.


If anyone hears of a fix, please shout. If I hear anything back from Apple I'll update.

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10 replies
Question marked as Top-ranking reply

Nov 4, 2023 10:19 AM in response to mfleming3409

I have a similar problem with AU Multiband Compressor when using it with Final Cut Pro. It is my go to compressor when mastering the sound tracks.


After adding it to a clip, pressing the icon next to its name to bring up the graphic adjustment window crash quits FCPX every time. It worked until I upgraded to Sonoma.


I have sent a bug report to Apple because I really need this effect - I'm sure there are other similar effects, but I have all my presets for this particular effect and know it like the back of my hand so don't have to think.


If anyone hears of a fix, please shout. If I hear anything back from Apple I'll update.

Garageband AU Multiband Compressor UI not working

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