The AMR file is not one of the supported audio files supported by html5 audio text. See the list below for supported audio formats:
http://en.wikipedia.org/wiki/HTML5_Audio#Supported_audio_coding_formats
I would recommend you convert your amr file to mp3 or ogg, and then download it and play it on my server.
original answer:
The code indicates the mp3 file. Are you sure you installed the amr file?
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