Sound bug at Brewery Level

[Mark]

Bug 1744 logged:

Toward the end of the Brewery level (you're a gimp trying to escape) 
the redneck "Ya Hoo" sounds tend
to loop on top of each other, creating a very non realistic sound - 
sort of like a bad "Redneck Ya Hoo
Remix."

Code should probably be added to prevent the redneck screams from 
playing until the current sound
has finished.

Otherwise, looks like it's pretty stable so far - going on Thursday....