:plralive=0,activated=0:activate=9,state=13
:state=13:sound=audiobank\scifi\scenery\lifts\teleport.wav,state=14
:state=14,plralive=1:activate=0
That looks funky but it should prevent the song from being played multiple times the whole time you're dead.
It should play it only once per death as requested, but I haven't tested it so try it out.
I see that you are new to the forums so if you don't know what to do with the script above, then read the manual.
After reading the FPSC Manual you should be able to assign this script (as AIMAIN) to a dynamic entity (STATIC MODE = NO) and get your desired results.
Also note that there is a "Thread Subject Search" box at the bottom of this page.
It has most of the answers you are looking for and prevents the same questions from being posted multiple times. (keeps forum clean)
Welcome and good luck.