Yes as I said its an issue with your audio device. For whatever reason its not reading the audio data that is available to it. Sadly audio on Linux is such an absolute cluster fuck that it could be anything, I haven't the first clue where you would go to debug it. The calibre piper code will emit the readyRead() signal when synthesized data is available. It is then upto the audio device to read that data, which it isnt on your system.
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