Pro Flight Emulator PFE is a button based ATC addon with really good voices if one goes for the extra voice pack. You will have local variations there. Here are some samples. http://secure.simmarket.com/another company-online-pro-flight-emulator-deluxe.phtml Note the samples are done very clear, but you can alter the radio interference sounds and things in the program.

But maybe some folks did a freeware to just exchange the voices in the default ATC.