Did some quick search on Vader lines, of course, I do not know if they will work correctly based on ambient noise, music, sounds, etc. But there are these for sounds:
Darth Vader: No, I am YOUR faTHER!
Darth Vader: Obi-Wan never told you what hapenned to YOUR father?
Also if the M starting sound works, when he says the millennium falcon in the bounty hunter scene could that help?