I’m not sure what the cause of your problems is. All I can say is I had a problem with a crackling microphone, which I solved by buying a second-hand discrete sound card at EUR 13. I also found that the crackling itself was caused by a faulty microphone cable. Before installing the sound card the slightest crackle was amplified beyond control and effectively cancelled out any useful sound input. The thread is here: Crackling microphone
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