I found a solution:
Blackhole in my project was scaled to 125% and I found out that I wasn’t was not able to change scaling via settings. So I created a small project with Blackhole. There it was possible to rescale the plugin to 75%. Afterwards I reloaded my original large project and Blackhole surprisingly was set to 75% too and now automation follows in realtime!
Very strange, the scaling should be defined for each project separately…
