It may sound like a Monster Cable-style offering, but Griffin's new Noise-Reducing Audio Cable ($20) has been released for a reason: it is designed to clean up the "interference caused by some cars' electrical systems." By adding a noise filter to the six-foot cable, Griffin attempts to remove "the high-pitched whine of ground loop noise," which "can result when you charge your iPod as it plays in many automobiles." If this sounds familiar to you,…