Hi Lars,
it was always on 256. Verified this last night.
There just seems to be something weird going on with regards to how ios handles IAA plugin streams.
Its a thing of Evolution. It just takes time, IOS8 was a half step backwards for the Music community in regards to that but it will get solved I am sure. I love making Music with Cubasis even though i constantly have to reload my effects.
The only thing I am missing now is a bigger internal synth with a decent mod Matrix 