Bit Rate: 256 kbps
Audio sample size: 16 bit
Channels: 1 (mono)
Audio sample rate: 16,000 kHz
Audio format: PCM
But I doubt that it can be because of the bit rate, sometimes I use 44,100 kHz and the issue still there.
Both the Nuvi 1310 and 3760 work with MP3 audio files.
However, if one must use WAV files, the audio files must be of PCM 44.100KHz 16-bit mono audio format. Also, must use sox.exe version 14.0.1--NOT version 14.2.0.
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