Sound mod doesn't work

So, I've installed Schmelleck's 20b sound mod:

/d/4676-20b-rotary-sound&comments=1#c76552

But when I build a rotary engine, it makes no sound.

I even have all the Shift2Sounds rpk's and stuff installed, still nothing.

Any possible causes?

Did you check the ids in the blocks' java?

# IceD :
Did you check the ids in the blocks' java?

the mod comes with a modified java

probably ids in the rpk and java don't match that's all.

Added 1 minute later:

oh and don't forget to check that names in the folder and rpk file match, 1 letter can fuck up everything and file won't be played by the game.