I got a new car and got some subs in it (i was never a subwoofer type guy... but i'll admit they're pretty cool). Anyway... my current mp3 cds have a HUGE difference in volume and bass. This leads to constant adjusting of volume/bass. Is there a way to normalize the volume of 100 mp3s at a time? This way i can do all my mp3s in one shot and fix my problem.