I tried recording a guitar riff on my computer. My guitar is directly hooked up to my computer's mic jack. The only sound would be captured by the guitar's pick-ups. I tried recording a little and when I played it back, I could hear what sounded exactly like a loud, deep human-sounding scream and a blatant sob when the guitar came in. This is no joke and I'm really creeped out. I have never had anything come out like that in a recording. I tried recording over and over again and it did not happen again.