I've never played with Alberich, but I've basically just modded the file to cut out the sharp initial impact, and pitched it down / shortened it a bit. I did this a tiny bit more for the improved Alberich.
I am testing right now with the mod installed over top of Thomsen's Sound Pack, and it's working just fine (only testing the regular hull, no coating). I'm actually pretty happy with it so far. At first I thought it was too quiet, but now it is really growing on me.
I'll upload the first version in a short while, hopefully, and then everyone can let me know if it sucks or not!
So far, though, I think it's great – the sound is subtle but distinct, and then you hear it coming more frequently, and then you hear the roar of propellers overhead and...
When you're being pinged by two or more ships simultaneously, it really has the sound of multiple pebbles being dropped, too!
The Alberich sounds are probably going to need changing, but so far, I really like the uncoated hull sound!
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SH3: 100% Realism, DID, GWX 3.0 + SH3 Commander 3.2 + HITMAN'S BETA GUI FOR GWX 3.0 (in a word: AMAZING) + FM Interiors + SH5 Water + Thomsen's Sound Pack 3.2 + BillCar's Sonar Ping
http://tinyurl.com/billcarpingmod
SH4: 100% Realism, DID, RFB / TMO1.9+RSRDC / OM+OMEGU.