You’ve got a bad/broken headphone jack (or more realistically, a disconnected or shorted wire to the jack), a common problem in the e200 series. That is what’s causing your “Karaoke” effect. If you’re handy with a small-tipped soldering iron (or know somebody who is) it can be easily fixed. The e200 series was designed with a replaceable battery, so taking it apart is a breeze.
Have a look at this thread about how to repair it. You may be able to Google some more tips/pictures as well.
