You have drawn my attention. I have a nagging question that I haven't been able to find the answer to, is this single-player or multiplayer? NVM, found your moddb, says its singleplayer. Interesting...
Use audacity to create an echo about .2 seconds behind actual voice (make the decay on the echo die off really quickly). Optional: Then fiddle with FTT settings, maybe add wahwah, and possible some sc4 stuff.
Which tool are you using? If its MS Paint there is no hope. If its GIMP you wanna try use the selection tool and then you can use some of the hue adjustment tools.
Not upset, just hard to understand one sentence over the internet without voice inflection. I meant it as a practical suggestion, since I'm feeling far too lazy to look for twilek skins atm.