I've never attempted such trigger or what ever but it would go great with my next map. could any one tell me how to disable a units speech such as Ghost/Ling w/e.

YOu can't with a trigger. But a player can shut it off in the options. Options>sound>disable unit speech.
theres no other way? ? ? ? could of sworn ive was in a game where unit speech was gone

You can do it with a trigger phatdiddy.
Use the 'Mute Unit Speech' action.
Woah, now that's an action I've never noticed. WOw I feel like such an idiot. Sry bout that.
I guess i just never thought it had any use.
It's used more often than you think lol. Most horror maps for an example.