Please note that Apple’s Inter-App Audio comes with many limitations, including being limited to one instance.
A while ago we’ve summed up all of this in a dedicated Limitations of Inter-App Audio article. Furthermore, Apple came up with Audio Units, which can be seen as the successor of the IAA format (which is planned to be discontinued by Apple).
Cubasis comes with a duplicate function, to create an exact copy of a track including all of its settings.
However this will not help in the case of using Apple’s Inter-App Audio, which comes with its single instance limitation.
Give the feature a try with our own instruments/effects, or use an Audio Unit plug-in instead.
And please let app vendors know, that you want to see their plug-in to be released as an Audio Unit app!