If you need any sort of self-confidence therapy, then consider this poor man's portable solution. Sony's new NWZ-E450 entry-level Walkman may look rather ordinary on the outside, but it's got something unique wrapped underneath -- karaoke mode. Here's how it works: not only can you throw in .lrc files to get auto-scrolling lyrics for your songs, but the device can also automagically reduce the lead vocals and let you be the rock star. Of course, the latter feature may not work as well with your occasional dose of Slipknot, but a
