adding a new voice to the squad

[Silverfoot]

Hi,

I was wondering if it is possible to replace/add a new voice a unit within your squad, eg.  I downloaded a female characters addon and have a female in my group, but she speaks like an American male and not a English female!   :-\

Also (while Iam on the subject of possibilities), is it possible to display images (jpg, png, bmp, etc) during an intro, perhaps in the way the TV overlay effect works?

Thanks all