Hey guys, here am I again,

after trying all your suggestions I finally came to the conclusion, the problem is Lexicon Omega and not BiaB.
In earlier times I did run the Omega on Windows XP 32bit and everything was fine. Now, even with Cubase and Sibelius there are similar problems.

I don´t no how and why, but meanwhile, after changing a couple of constellations, I have choosen the MME driver and all of a sudden it worked! I won´t change and touch anything anymore. :-))

Thank you for your help.