Radio SIgnals

Hi people,
I've been trying to record a song with my guitar. I have my guitar plugged strait into my Mac Mini using a normal guitar cord with an adaptor into the line in jack. When I record something i hear Japanese people talking and sometimes weird little Japanese jingles. (No joke, seriously) I think it's radio signals, but I'm not entirely sure. Also, it only seems to happen when i use a distorted sound like"Metal" or "Modern Rock". I have no clue what to do and It's really starting to annoy me.

most likely your adapter, or cable is faulty/not properly shielded. reading the first bit after the "conversational part" of the Balanced Systems tutorial can explain it:
http://www.bulletsandbones.com/GB/Tutorials.html#allaboutbalancedsystems

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