[BillCar]

Maybe a difference in frequencies used? The accounts I've read from U-boat veterans who experienced ASDIC said it was like pebbles dropping on the hull, or the hull being hit with a hammer. Some said "wires being dragged on the hull" as well, which sounds a bit like what you describe? I know that active sonar was refined throughout the war and the frequencies kept increasing (if I remember correctly), so maybe the wires dragging sound is a late-war feature?

I'll probably wind up making multiple versions of this mod, so don't worry - if someone who can tell us definitively what's what shows up and says that that sound should be in, I will start making some recordings more like what you describe - then people can choose between the two. If it's a case of early-war ASDIC sounding one way and late-war ASDIC sounding another, then users can simply use JSGME to enable the pebble-hammer one for early war, and the screeching/scratching one for late war!

http://www.filefront.com/15620347/Bi...Ping%20Mk.I.7z

There's the first version for people to try out. The Alberich sounds are pretty lame, I will work on them for later - they weren't really a personal priority, since I have never used a sub that had Alberich.

@ lorka: there is an MP3 file linked above your post that you can try out - doesn't have the Alberich files, just the uncoated hull sound.