Try messing around with this.. I know it works..
keep in mind you may have to enable and disable raido if you choose to use this kind of chat..
I'm not sure exaclty.. been a while since i used this..
It's from an old mission I made.
EnableRadio TRUE
player sideradio "radio2"
[_side,"HQ"] sideChat "Maybe this text might work for you."
enable and disable radio is nice for missions with ai in them.
you can disable the radio for the mission and not have to hear them.
or re enable it in certain scripts just for those scripts.
then disable it again at the end of the script, to keep chatter down from ai's.
always good.
unless your using them to spot things.. XD