Well first: You need to use a dialogue editor to change the subtitles. The editor in Kotor Tool doesn't work I believe. You can find a working one here
Secondly, if you're trying to do what i think you're doing(make the droid actually voice something else), then you really need to learn how audio recording's work. You cannot make anyone say something different.
Please try to think things through before you post a thread about it.