High pitched buzzing when recording

This is not a request for help but to advise of a strange recording problem and its solution.

I recently began to use audacity for recording. Whenever I tried to record there was a high pitched electronic buzz overwhelming the desired input signal :frowning: After much playing with cables and plugs I was amazed to find that the cause was the “ethernet over the power network” box that I using. The earthing in the apartment is poor so that probably does not help but for sure with the ethernet box out of the power socket the noise was gone :smiley:

Hope this is useful to someone

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That’s the verb, now we need a noun. Recording…what?

Koz