Speak
From Scriptwiki
Note: This function is only available in the beta version of mIRC.
Speaks the specified text.
/speak -spclu [speed] [pitch] [text]
Switches
* -s = speed (0 to 100) * -p = pitch (0 to 100) * -c = clear all queued lines * -l = apply lexicon settings in speech dialog * -u = apply option settings in speech dialog