As you may know, I once created a TextToWav extension. I checked your extension, and it creates also just a wav file like mine, just with the ending .mp3. You can check this in any audio editor. Or you can just rename it to .wav and you will see it will work.
Hint: When you want to create a mp3 file you need a library which is very big
(e.g. lame library) because Android doesn’t support encoding to mp3 yet.
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