I've recently bought a Nuvi 1390 to place my Nuvi 270.
It seems to speak the street names with some voices (Text to Speech?).
With some other voices.....no street names (non TTS?)

I've successfully added the KITT voice and Wallace&Grommit voice (by adding their unl codes)
and neither say street names, which is OK.

But I'm struggling with Pierre Pissant.

In the Nuvi 270 I just had to replace one of the 'English like' languages with Pierre.vpm
and give it a name like English_American_.vpm to try it out.
When I do this in the 1390 it just disappears off the available voices list.

Is the proceedure different for the Nuvi 1390 or do I need to use a unl code?