Hi,
I am quite new but I found a way of putting any music you want on the gramophone. I recommend the Das Boot Soundtrack which you will buy of course and not download it free off youtube
Anyway, if you convert it to .mp3 and chuck it into the \sound\gramophone folder, you can play anything. But Doldinger's piece "Konvoi" was written for the story as they closed in on the surface for a night attack in stormy weather...you got to try it, it's fantastic.
T K W