I have use this program from time to time
Over at hxxp://turboccc.wikispaces.com/TTSVoiceEditor
Link
go over to the site they spell out how to make changes
All changes should be done on the PC and not on the Garmin.
Backup first.
How-To
1- Start TTSVoiceEditor.
2- Use File->Open to open a VPM file (TTS type only)
3- Click twice on the word/expression you wish to change
4- Enter the new word/expression. You are not limited to the original length. See "Hints" below.
5- Click OK to change or Cancel to abort this change
6- Modify as many words/expressions as you wish by repeating steps 4&5.
7- Optionally, you can change the voice rate, the voice level and the screen name.
9- Use File->Save to save the new VPM file. Add ".vpm" to your filename. You still need to use the original .vpm file name.
10- Copy it on your Garmin in the Garmin/Voice directory.
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