Changing Speedcam warnings

How do I use spoken warnings instead of dongs for the speed camera warnings on TT One XL.
I have looked through all menus and cannot see any ogg files stored anywhere.
am I being thick or is there a trick?
Thanks to all for all info on this incredible site.

Spoken voice speed alert *.ogg files are not part of TomTom's official systems.

These customizations are available via third party web sites but they are not something we deal with here at NT

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Thank you for that.
Intersestingly I have been playing around and used POI speed cameras then tried adding ogg file to corresponde with them into sound folder, when I try to attach this sound file to the warning I do not get any sound from the unit at all, if I then delete the ogg file from the sounds folder all works well, am I missing something here.

chrisdobb wrote:Thank you for that.
Intersestingly I have been playing around and used POI speed cameras then tried adding ogg file to corresponde with them into sound folder, when I try to attach this sound file to the warning I do not get any sound from the unit at all, if I then delete the ogg file from the sounds folder all works well, am I missing something here.

You place the speedfile and the ogg file with the same name in the country map.

Thank you, I'll give it a try