I have a Garmin 3790t.
WAV file did not work.
MP3 was no problem.
Although this is a new experience for me, I doubt that it was a finger problem.
As mp3 worked I did not look any further for solutions.
I have a Nuvi 760 and have only ever used MP3 with no probs. I would have thought that WAV format would use to much space on unit or card.
Sound quality through car stereo is pretty good.
As you all know, when sound is recorded, it is represented electronicly as WAVES. So, In order to store this sound on your computer, the waves must converted to digital format.
It is known that .wav format files gives out more frequent sampling will give a more accurate representation of the wave. In fact CD quality sampling is done 44,100 times per second. Each one of those 'samples' is 2 bytes in size (16 bits).
However, MP3 was developed as a form of compression which reduce the size of .wav files, with MINIMAL loss of quality.
MP3, also known as MPEG layer 3, has become a popular format for reducing the size of audio files. Most of the music available for download is found in this format.
Conclusion, if you have enough space, go for .wav format, if you have insufficient memory space, you should go for .mp3 format =)
If anyone has a question, the Garmin 1490 does use WAV files. As you probably know, sox.exe has to be placed in the same directory as POI loader. Works great! You will then get a new menu option to enable/disable the audio alert.