First, thanks everyone for your help and patience so far, I really appreciate it.
I re-tooled the script in such a way that it does precisely what I want it to do, with the major exception that I still can't get it to stop repeating the 4 sound clips in an infinite loop. Ditto the chat text (when included in the script; currently it isn't).
A couple of variations I've tried either restricts it to the normal 2-sound-file limit (which doesn't loop), or which plays the 4 sound clips, in order, with no loop, but each sound file requires its own separate click of the prim to play (they aren't strung together).
Just to clarify, this is what I want the scripted prim, which is a button that is worn by the avatar, to do:
1.) it can by selected/clicked by any nearby user, myself included.
2.) the click activates the string of sound files, of which there are 4, which play in order.
3.) this isn't crucial... but ideally, a text message plays, once, in local chat.
4.) after the 4th sound file plays, the sequence stops automatically, both sound and text, without the need to click the prim button a second time to stop it. To repeat it would require another click of the button.
Seems like this would be very simple to achieve.
Here's my simplified new version of the script, which is minus any chat text function (which, in its current looped form, spams local chat terribly):
Again, this does exactly what I want it to do, except for the automatic, endless repeating.