Here are links to the new FSCaptain voice packages that we'll make available as part of the 1.6.3 Beta and 1.6.3 Full releases. In reverse alphabetical order:
Regina, a chief Flight Attendant who speaks English and German:
You can download these ZIP files and extract the folders within to your \FSCaptain\Sounds\ folder, or you can have them installed for you with version 1.6.3.
Your \Sounds\ folder will look like this after a proper installation....
[edit - this screenshot does not account for FO Peter (English)