You can try to mimic them, but dont forget the most important part: acting. The audio clip will your stage. I wont be able to see you, so I must be able to feel you through your voice. Get inside the characters' heads and become them.
Would you like to audition for my TT audition? If not you, do you know anyone who would? Also, do you know any script writers, audio/video editors? - http://voiceactingalliance.com/board...ubs&highlight=