Thanks all!
Don't you agree with me? In my opinion it is quite annoying to hear the bell "RING-RING" during gameplay. GWX should change this ... it's not authentic too.
I downloaded the DBSM (Das Boot Sound Mod) however, now my saved game doesn't start up anymore?
I then disabled (via JSGME) the above mod, but still problems.
Anyway, thanks for the help. I will figure out what the problem is.