Hi rakiehl,
Thanks for your message.
Assuming you’re talking about the multi-timbral SampleTank project setup in Cubasis, please note that Inter-App Audio comes with many limitations (as previously noted). While the multi-timbral setup allows you to trigger more than one SampleTank instrument in Cubasis via IAA, the workflow comes with limitations that require workarounds.
Please have a look at our Limitations of Inter-App Audio article to learn more. As mentioned above, Audio Unit which more or less can be seen as Apple’s successor of the Inter-App Audio format provides more flexible options in this regard, and many app vendors release their instruments and effects plug-ins in this format.
Hope that helps!
Best,
Lars