Excuse me if something like this has been posted.
I was searching through the voice files and came across the info.ini file in Voice_TTS-nua-eng-us-f1.zip folder.
Within the file the following line appears:
testsound="Have a nice trip, drive carefully."
Just for kicks I changed it read:
testsound="Yo big mama, have a nice trip, and remember to always drive carefully and expect the unexpected."
It worked!! The much hated Samatha read the line perfectly. Didn't try to add any swear words but thought it was cool nonetheless.