Hi Dot, thanks for the comment! - I agree, Bale's voice was a bit much, I didn't rate the suit either and I really didn't get on with 'Dark Knight Rises ' at all. But, I think in terms of story and character development I really like 'Begins' and 'Dark Knight. '
Regarding a voice modulator, I'm pretty sure it's just been Ben Affleck's batman that's used one. But they make a lot of sense! 😁👍