AUv3 extension not running in Garageband

Question

Created Jul ’20

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Is there any additional setup required to run an AUv3 extension in GarageBand?

The extension runs in AUM and AudioBus hosts, but for some reason the render block is not called when loaded into GarageBand and the parameter sliders just freeze when trying to set them in GarageBand.

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Answer 1

Asrodot OP

Jul ’20

Is it an instrument or an effect?

My experience is limited to effect units.

For some reason Garageband only starts calling the render block when you start playing your track, and when it has actual audio data to send to the plugin. So playing an empty track won't result in it starting the render block.

Freezing parameter sliders: I have seen those at some time. As in : Garageband knows all the parameters, but they are all set to 0 and you cannot changes them.

I am not sure what causes it, but you might want to try again in a blank Garageband project. Garageband does state saving on its projects ( by reading and setting the fullState property ) and I have a feeling that this sometimes messes up things. Especially on a plugin that is still in development where old fullState values might no longer be compatible with your new version.

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Answer 2

Son1cSect0r OP

Jul ’20

Thanks for responding. It is an instrument. Other instruments seem to play just fine as soon as a key is pressed. There must be some additional flag to set or something.

I have not implemented the fullState yet, so it could definitely be that. I will have a look. Thanks again.

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