Having Sound Issues with a Simple Script

I tried to script a sound into an object that I'm wearing that will play ONCE when I start typing, but for some reason it won't work. The name of the sound is correct, the sound and the script are both in my worn-object. I've tried putting it on a timer, but that makes the sound loop as I type, which is pretty annoying. I've tried using both llPlaySound and llTriggerSound, and neither seems to work.

Here is my current script. If someone could please point out what I did wrong, that would be a big help. Thanks!

default
{
state_entry()
{
if (llGetAgentInfo(llGetOwner()) & AGENT_TYPING)
{
llTriggerSound("dialog up",1.0);
}
}
}

state_entry() is only executed when the script begins running or is reset (or changes states but that doesn't apply in this case) so your typing check is only being run once and then never again.