further to this, its not change one file and they all speak different, you need to change each and every file yourself, so you need to find "turn left" in the voice you want then send it, all ive changed to date is recalculating to "DOH!" and the beeps to less anoying ones.
i was looking for some software that could open the tomtom files as all the files you,ll need will be in there ready to convert in the voice of your choice.
just to claify it does work like i said ive dih! instead of recalculating. with all the voice files i needed it would take probaly an hour to convert and send them all to the unit, just getting the voices tho, have you tyed finding sound files on the net that say turn right or at the next roundabout its hard thats why i want to find some software to open tomtom voice files and try to convert them.