then, you'll have to use the random=X condition
Don't use this, it's only ROUGH. You'll have to clean it up yourself, as this is not a request board.
:state=0,random=10:timerstart,state=1
:state=0,random=10:timerstart,state=2
:state=0,random=10:timerstart,state=3
:state=1,timergreater=10000:sound=$0
:state=2,timergreater=25000:sound=$0
:state=3,timergreater=40000:sound=$0
This will take the random variable 10, and randomise the three different lengths of time after which the sound will be played:
state one after 10 seconds, state two after 25 seconds, etc.
This is only for 3D sounds, I think. And it's rough and untested...
A starting Games Designer. Need levels, characters and anything drawn and designed? Let me know...