TT voice problem

[AtmelAce]

I have put some voices in, but to get them up on the screen I have to select 'NO' when it asks ' Do you only want to select from voices in the same language ( english uk)'
.
I've tried changing the .vif file but whatever I do, they don't appear in the english only selection.
Am I doing something wrong? Missing something? Or is that how it is...