Lots of noises and « crashes » when I use Moog model 15 and Model D as AUV3; those audio units cannot be used anymore in my current and past projects !
I have a 11’ 2018 iPad pro which runs on iOS 12.1. I use the 2.7 version of Cubasis.
Please give the latest available iOS 12.1.2 update a try, and check for available Moog updates as well.
Both updates should address the performance issues, using the latest available 11" + 12.9" iPad Pro models.