Gah... when you've used filters / effects on a character you've voiced, ALWAYS make a note of exactly what effects and settings you used. There may come a time when it's necessary to voice some more lines for that character, and you don't want to have to spend time figuring out how to make it sound like it did last time, do you?!
Incidentally I use Goldwave for all my sound recording / editing - an excellent program. If you're looking for a good sound editor to use with your own games, I'd definitely recommend it.