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I'm working a lot with ALSA and I don't know what I did wrong but when I record with:

arecord --channels=1 --duration=5 --format=dat --vumeter=stereo test.wav

...and play it back I only get some noise, whereas it worked before.

So I reset ALSA with:

sudo /etc/init.d/alsa-utils reset
sudo /etc/init.d/alsa-utils restart

A message indicates that I reset ALSA successfully

[ ok ] Resetting ALSA...done.

But I still have noise when I play back what I have recorded. What could be causing the noise, and how do I get rid of it?

1

Try using alsamixer, you may have a source that is on making all that noise. You can mute individual sources using this app.

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