Hi @belldu,
Thank you for your message.
Please note that Apple’s Inter-App Audio format comes with many limitations which we’ve summarised in this article many years ago. In addition, Apple’s Audio Unit format provides much more flexible options ad can be seen as their successor of the Inter-App Audio format.
We suggest, using Audio Unit plug-ins where possible, and to ask app vendors to release their plug-ins in this format (to make them aware about the demand).
Hope that helps!
Best,
Lars