Trevor got the best voice I think. I picture Trevor as having a voice like that, but deeper like Alderton's take. I actually think Mandy has her best voice, it's not my ideal voice for her at all, but it's not nearly as shrill as the other actresses. Helen has a decent voice. This was a good change, because I think black characters need black actors. Now if only they recast Norman and Elvis...or better yet, cancel the series altogether because I'd rather have new kids' firefighter shows that may be bad than the butchering old great ones.