DaveHagen wrote:I have the feeling I'm getting ignored
Maybe because your problem is about using the PMDG aircraft and you have played around with things so …. You could ask on the PMDG forum assuming one exists.
If I were you I would go back to scratch. Sound like you have messed up and maybe best to start over. Your situation is far from clear and still cannot see what sound mod you downloaded?? Not surprised replies have been slow in coming.