Are there 2 different voice packs used, one for users and another for AI? ATC cannot seem to pronounce many of the airports and ends up spelling them out instead. Plus they say Air Canaaaaaaada (sounds funny actually) , eventhough they are able to pronounce it correctly for AI Traffic. 
I find that FSX voice pack was much more natural and would have expected it to be even more advanced 14 years later. Is it a setting by any chance that I may be missing?
Thanks for your help.