I tried the soundmod on two patrols now and it really is good... but there are some things I want to mention:
1. when switching through the torp-tubes the sound is very annoying hearing everytime I choose another tube
hard to please everyone. Theres people who love this sound, other hate it. What should I do?
2. the Diesels are well and fine just on the two highes speeds they seem not right.
I mean on "Voll Fahrt" (Full) and "Äusserste Kraft"(All Ahead Flank) the Diesels should have a higher frequenzy... they sound a bit like an tracktor...
Have you seen the movie "Das Boot" when they just got surfaced after that disaster at Gibraltar and head home... when Johann the Machinist is in the Diesel Room and the Diesels are running.... thats the frequenzy
I'll get my directors cut version of das boot and try to capture a better sound engine. I'll release a patch for this sound mod soon, with a lot of fixes.
3. the background sound/ interior sound... there are some minor mistakes... which I as German just found:
- suddenly they talk about "belüften" or a "Zerstörer" which is just not right at this point but never mind (just got when suddenly I hear something about a destroyer....
)
Interior sounds are very complicated. How and where can we find sounds what will match perfecly into the game? This is the best interior sound I've ever came across. I'll try to get a better one from das boot.
4. some sounds are too modern... I mean when you select a torp tube you hear that nice "activation" sound which just sound like a modern device used today but not back then.... there are more I just cannot remember
Same as first.
5. when you order peri depth you can built in parts of the alarm-tauchen (crash dive) sounds which also is imho not right.... peri depth was reach very slowly without people running around in the boat - and you hear the 2WO from "das Boot" too often shout "Warschau" (Warsaw) which if I am not right is a curse for falling/hitting (Have to wach the movie again sometime) and this is also imh annoying.
Yes, major problems when diving. Whis will be fixed too.
well not bashing just my 2cts
I'm still searching around..
what I like but gave me a headache is the collision sound... very nice.... as long as you are not stuck between a ship and the shore (please do not ask how I got there
)
You should hear the collision with the ocean floor with the hydrophone. 
I also like the comment of the guy when you hit the other "Sollen wir helfen? Vieleicht lebt ja noch jemand" "Klappe Reden können wi später!" (or something like that) That is so lol! ... very unrealistic ,,, yet so LOL
Im not following. Which sound? When? Where?
Overall I give your sound mod
a 8 out of 10 as I just don't like too much (it gets annoying in time to hear the very same sound on trivial things like selection of a tube etc. - for me less is more)
Just me oppinion and maybe some ideas for you.... and darn! Who doesn't like shouldn't use it! right?
For you less is more. For other people, the opposite applies. How the hell can I please everyone?
But again great mod
(I know how much work might have gone into it)