Audacity Forum

Your posting says a MacBook Air using Sierra 10.13.6 but your message header says Catalina. Your symptoms are something Catalina might do.

Koz

I upload the audio file

Which audio file and to where?

We need more details to figure out what's happening. Are you producing a podcast?

Koz

You needed terminal to record a built-in microphone? That's odd. Mojave is still pretty well behaved. Which terminal fix?

Which microphone? Which machine? How would I buy what you have?

Which Audacity?

Koz

I think the personality of your damage and the action of those antennas happens to match. It rotates rapidly and fires pip pip pip pip. If it happens to be aimed to you when it fires, you get one of those holes.

Koz

Who is this "we" you speak of? Audacity, but it's not for what you have. A bad combination of microphone and computer can give "frying mosquitoes" or "whine" sound. It turns out if you subtract the most significant overtones and harmonics from a common USB digital sign...

Oh, and the other half of the question. You don't fix noise reduction or compression distortion. You record it over. Sorry. I see you posted an MP3 sound file as an example. If you make an MP3 wrong—at too low a quality—it can sound like that, too. Never do production in MP3. When you get done readi...

That's voice processing typical of Skype or Zoom. Did you have a conference, class, or chat between the two performances? It could be something else, but that is the poster child of chat processing. Slightly wine glass or milk jug. If that's it, you should know that's how you sound to everybody else...

Desktop > Apple (upper left) > System Preferences > Sound > Input. Can you see something that might be the turntable and does the bouncing sound meter work when you play something?

Koz

I begin to see the problem. No headphones. The Oxygen is just a controller. Did it come with MIDI Generator or Synthesizer software? If it did, you can run that and make the computer play music. Then use foldback software or settings to make Audacity record what's playing on the computer. https://ma...

Do you have Generate > Metronome? Anything like that will work.

Koz