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The pyttsx3 library in Python may not produce any sound if the audio is not properly configured. Here are a few possible reasons:

1. The audio driver may not be installed or configured on the system.

2. The audio device may not be selected as the default output.

3. The volume may be muted or turned down.

4. The version of pyttsx3 may not be compatible with the operating system.

To resolve this issue, you can try the following steps:

1. Install and configure the audio driver on the system.

2. Select the audio device as the default output.

3. Check the volume settings and ensure it is not muted or turned down.

4. Check the version compatibility of your pyttsx3 library with your operating system.