Plays Amnesia but not Overture, Black Plague and Requiem

[anvo]

Hi!
I searched for libopenal.so files in my /home directory and I only found three versions of it, in two subdirectories of PenumbraCollection dir.

libopenal.so.1
libopenal.so.1.3.253
libopenal.so.1.8.466 in PenumbraCollection/BlackPlague/lib, and exactly the same three files under PenumbraCollection/Overture/lib. There is no "Penumbra" directory under the "PenumbraCollection" dir! I can't tell if this is normal/expected or not...

I renamed all six different versions of libopenal.so to openalso.1.x.xxx. Tried to run the three games, one each time, and they do not run! The only thing changed is that now, after renaming the files, the desktop resolution does not change at all, as it did before: only the screen flashes to black for a few seconds and then goes back to the desktop normally...

Any ideas...?