Here is my work on generating the Audio through the available online tool.
1. A voice note or virtual voice can be created through the below link address
2. The Audio file to store on the SD card must be in the .wav format with 16000 Hz, 8-bit unsigned PCM mono quality
That can be converted using below address
3. Using SD card and Audio amplifier the virtual voice an be played
Example Audio Generated : https://drive.google.com/open?id=1aLAzBIzGPhs3auwF6FlTWumd5YZnYv2s
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