System-recordings module - how can I generate a compliant wav file?

Hi all,
I remember that I was able to generate and use audio files into freepbx using a text to speech called dspeech.

Now I can’t hear anything.

I save the audio file in wav 16 Bits, at 8000Hz. Then, I rename the extension in .alaw but I can’t hear anything.

Can you point me in the right direction?

Audio file must be MONO , 16bits at 8KHz.
Format must be .wav not alaw if I am not mistaken

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Aaron is correct. I use Audacity for my recordings and that’s exactly how they are exported.