Make a script that is called to handle the function of evaluating the text. This one does that.

In your other scripts, set the $sent = "whatever you want to say"

Then

Call this script.

You could also use waitforchange on the $sent.... The draw back is you couldn't say the same phrase twice in a row.....

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sayezb("What you want to say") 
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would be changed to if you are using the Script Manager which I would recommend.

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$sent = "What you want to say"
ControlCommand("Script Manager", ScriptStart, "Text Speech Engine")
SLEEP(2000) #added to wait for the script to process.  May not be needed.
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[edit] The WaitForChange($Sent) would need to be added to the Text Speech Engine. As soon as it got done speaking or maybe just before, you could $Sent = "" so that the script would have time to evaluate what it needs to before the variable is set to "" again.

This would allow you to just use

$sent = "What you want to say" instead of SAYEZB( "What you want to say" )

you would need to put the Text Speech Engine in a loop and call it at the start of the project in an init or startup script.

Good point Rich and Richard.

@Richard Unless you have the $sent variable "reset" to something immediately after waitforchange

Ok... I figured a repeatuntil loop in the speech engine (to keep it running) could be used and a waitforchange right after the repeatuntil command...