Thank You for all Your efforts. Looks like in some files the MIDI export from BIAB shows that problem, not all.
The MIDI files show the behaviour not only when imported into Guitar Pro but when imported into other programs, fe. Midi Editor, too.
I thought it might have to do with the 5x chorus, but that is not the root of problem.

Last edited by rockbandguy; 05/09/25 08:52 PM.