Ok, I think I got the sound files installed. Big improvement! But man do I suck!! I just got sunk by a tanker that rammed me!! I thought I was deep enough. I blew balasts and surfaced, figuring my deck gun could finish it off, and to my surprise the tanker was armed!! The ship id book didn't say it was armed so I assumed it wasn't.
And I realized the reason why my external camera was still above water when I was at periscope depth. It was because I wasn't deep enough. As soon as I tried to go deeper the external view went under water as well. I can see now I'm gonna have to be a little more careful.
But I can see myself having some fun with this mod.