May I just say its nice to see some old faces again on here, been a while. One thing about Grievous that always bugged me was that his voice was always terrible for the way he looked. I, many years ago tried to find a new voice for Grievous. The only way I could hear it was this:
http://www.youtube.com/watch?v=bfOCJ1MfIFs
Skip to 0:11 seconds for my interpretation of Grievous. Someone used this sound and actually dubbed it over footage at some point but it got took down, this video is a few years old now with really bad quality sound but i hope it makes its point of trying to make Grievous more animal like.