How to Download Maps to a Micro SD Card for Garmin Device : Using a Garmin I did this tool when I thought VoiceEditor could not do it. In my opinion, if you can use VoiceEditor, I do not see why you would use VoiceUtility which seem to have less feature. It is also not totally free and if you modify more than 50 WAV files, it will cripple the audio quality. It seems to be only a VPM file splitter and merger.
If you want to have more fun, you can also create your own sentenses by clicking on a sequence of audio samples on the left and then click ADD. If you click on the Edit tab, you can also see on the left side all the audio samples for each WAV and on the right side all the sentenses serie of audio samples to make a phrase. You can find more discussion about it in French here. I decided it was time to highlight these options in more details. There are other options to work with non-TTS voices. Make sure your WAV files are also recorded with the following format. The concept is very easy, however recording and trimming all the WAV files will require a lot of work.
