Much as I love Sampletron2 it is problematic in Cubase 11. It is laggy and affects the graphics with a very jerky progress of the timeline. The representation of the playing on the virtual keyboard is out of sync and very late. Has any other C11 user got the same issue? B3X has similar issues. Both often have to be frozen when used on a busy project.
The sound is in time with a few occasional clicks. The problem is with the graphics. Things can get awkward if I have a number of IK instruments up and playing at the same time. And yes I have altered the preload buffer and the multiplier.