Glad you are making progress. How does the audio sound in audacity? After converted?
You can silence or fade the end of the sample in audacity. Pick a zero-crossing to start and end anything you silence/fade. Maybe...
Is it running on battery power only? If not, could help.
Could be the microSD card. It's a big power draw and can induce noise in my experience, although I've only worked with writing to microSD card (reading I would...
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