The source you’ve set is incomplete. It’s only the prefix of the sound file, not the actual audio data.
Two things that are helpful when asking about APIs:
- Provide a link to the relevant section of the documentation.
- Include the value of the green response block as text (you can assign it to a text input’s text and then copy and paste it here). It’s best to format it using the </> button in the toolbar above your post. That removes smart quotes and other symbols that can invalidate a JSON response.
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Need help? How to Ask Great Questions 
Debugging A Project API JSON Tutorial
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