Nothing too complex, again, really just something to help get myself back into the feel of it.

Code:
START SETR sd0,d0; d0 is the number of frames between each sfx
 RNDR sd1,d1; d1 is the number of different sfx - 1
 ADDR sd1,d2; d2 is the number of the first sfx
 PLAYSOUNDR sd1; Be sure all of the sfx you want are in range!
WAIT WAITFRAME
 SUBV sd0,1
 COMPAREV sd0,0
 GOTOTRUE START
 GOTOFALSE WAIT
Instructions are in the code's comments. Be sure that all of the sfx you want to use are in range with each other. What do I mean by this? If say, the room is one full of birds, and you want bird tweets to be playing everywhere. If you have 3 different bird tweets, and you set the first one as 60, then the other 2 must be 61 and 62.