Try to re-install Kate's voice data:

English: (UK)
[Only registered and activated users can see links. ]

Please remember the TRUCK navcore has a different Loquendo engine from the one that comes with the original Go_x30 navcores.
As such, also voice data is different.

All the following voices are for Loquendo6:

English: (US)
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]

English: (UK)
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]