Nether ambience sound doesn't work with packs active

In the Nether you can’t hear all those creepy and menacing sound of ambience. It’s all silent and occasionally it drops a CAVE sound.

I noticed this has been happening for months. First I noticed this with True Realism HD texture pack, and at first I thought it was pack’s fault. However, recently I’ve bought Action and Stuff texture pack, and…same problem.

With Vanilla Vibranr Visual and even Advanced graphic is OK.

I won’t buy any more packs to verify it but, I’m quite convinced the issue is with pack installed.

I already re-insralled many times the game but nothing changed