Do a Google search for TTSVoiceEditor.
TTSVoiceEditor
Edit and change Garmin VPM voice file (TTS voice file only)
--------------------------------------------------------------------------------
Main Features
�Change phrases like "recalculating" to something more enjoyable like "We are lost again! Next time, listen to me."
�Control voice volume (level)
�Change voice rate (speed)
�Change the voice screen name
�Import/Export from/to text files (used for sharing/cleaning)
--------------------------------------------------------------------------------
Model Compatibility
TTSVoiceEditor has been tested on Garmin models:
�Nuvi 7x0, 255W, 260, 3x0, 6x0, 8x0
�Zumo
�StreetPilot C550, C580 and 2730.
�StreetPilot C310, C340 and C510. Read this and that by Hornbyp.
It is NOT compabible with the following models:
�Nuvi 250W (this model does not support TTS voice)
�StreetPilot C320 (this model does not support TTS voice)
Bookmarks