High pitch noise with built-in microphone in the MacBook

For a time now I had gave up on finding out what was the problem with a mysterious high-pitch constant noise in any sound recording in the macbook.

Today, I solved the mystery: It was my USB mouse.

So, here is some advice for anyone with weird noises on recordings: try unplugging everything you can unplug.

I don’t think this is an exclusive problem of the MacBook (3,1).
So I hope it is useful to someone else.


Also. Here is a funny mouse, working out. You are welcome.

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