the way I'd do it, is use a custom sound of your own, .ogg it, descript it, and in a script write
#loop
? not (alive
unit2name):goto "deadtalk"
goto "loop"
#deadtalk
enableradio false
player say "2isdown"
~1
enableradio true
"2isdown" would be the class name of your sound, describes in your description.ext, dont ask me how description.ext works, i'm having trouble of my own.
also I think this belongs in the sound and cutscenes forum
cheers ;D