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We realized that all files you upload are not real MP3 format. The audio files couldn't be played, because they are not MP3 files. There are three solutions:

1. You can directly record the speakings on testbig site. You don't need to record offline and upload:
http://www.testbig.com/node/add/speaking

read the instructions carefully. It is easy and convenient.

2. If you want to record speakings offline and upload to testbig site. You will need to find a good MP3 recorder software and record MP3 files properly. We suggest you use Audacity:
http://audacity.sourceforge.net/

3. If you have recorded the speakings in other format like MP4, You can't change the file name from MP4 to MP3 and submit. you can go to this site: http://audio.online-convert.com/convert-to-mp3
and convert the files to real MP3 files, and then submit to testbig site.

Let us know if you have more questions.

testbig tech support