Download a foreign voice, e.g. Ben (NZ), you will find them after download here in #139:
[Only registered and activated users can see links. ]
Rename the *.chk of a PNA-voice-file of your choice to data98.chk and replace the original-file in the voices-folder (only the *.chk, don't touch the *.vif !)
In result Ben talks with the new voice of your choice. You can repeat this with other foreign-voices to enlarge voice-range of the app.