Hey Cyril,
I've been experimenting with different buffer sizes in Logic, from 256 up to the max. For the VEP Au I have two buffers set. I am wondering if I should turn off plug-in delay compensation, which might only be confusing the matter.
When I have a Kontakt running in the VEP projects, should I set the buffer size to 0? Are all these different buffer sizes confusing things even more?
Also, I did read a link in another thread regarding Logic Playback, stating that unless one is actually recording on an instrument track, a different track should be selected, for instance the Master Output, as Logic goes into live mode simply be selecting a track, which is great for capturing a take when record wasn't activated but is quite a strain on the system, especially if there are already instruments playing on that channel strip.